Fixed some documentation and moved Source install specific to other file.
This commit is contained in:
parent
92e603727f
commit
494c2785fd
2 changed files with 300 additions and 121 deletions
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@ -19,7 +19,6 @@ that comes bundled with Omnibus GitLab packages.
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- [Prerequisites](#prerequisites)
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- [Prerequisites](#prerequisites)
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- [Redis setup](#redis-setup)
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- [Redis setup](#redis-setup)
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- [Existing single-machine installation](#existing-single-machine-installation)
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- [Existing single-machine installation](#existing-single-machine-installation)
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- [Installation from source](#installation-from-source)
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- [Omnibus packages](#omnibus-packages)
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- [Omnibus packages](#omnibus-packages)
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- [Configuring Sentinel](#configuring-sentinel)
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- [Configuring Sentinel](#configuring-sentinel)
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- [How sentinel handles a failover](#how-sentinel-handles-a-failover)
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- [How sentinel handles a failover](#how-sentinel-handles-a-failover)
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@ -31,7 +30,6 @@ that comes bundled with Omnibus GitLab packages.
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- [Redis replication](#redis-replication)
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- [Redis replication](#redis-replication)
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- [Sentinel](#sentinel)
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- [Sentinel](#sentinel)
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- [Omnibus GitLab](#omnibus-gitlab)
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- [Omnibus GitLab](#omnibus-gitlab)
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- [Install from Source](#install-from-source)
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<!-- END doctoc generated TOC please keep comment here to allow auto update -->
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<!-- END doctoc generated TOC please keep comment here to allow auto update -->
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@ -161,58 +159,6 @@ To disable redis in the single install, edit `/etc/gitlab/gitlab.rb`:
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redis['enable'] = false
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redis['enable'] = false
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```
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```
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#### Installation from source
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**Configuring Master Redis instance**
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You need to make the following changes in `redis.conf`:
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1. Define a `bind` address pointing to a local IP that your other machines
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can reach you. If you really need to bind to an external acessible IP, make
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sure you add extra firewall rules to prevent unauthorized access:
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```conf
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# By default, if no "bind" configuration directive is specified, Redis listens
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# for connections from all the network interfaces available on the server.
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# It is possible to listen to just one or multiple selected interfaces using
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# the "bind" configuration directive, followed by one or more IP addresses.
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#
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# Examples:
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#
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# bind 192.168.1.100 10.0.0.1
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# bind 127.0.0.1 ::1
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bind 0.0.0.0 # This will bind to all interfaces
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```
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1. Define a `port` to force redis to listin on TCP so other machines can
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connect to it:
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```conf
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# Accept connections on the specified port, default is 6379 (IANA #815344).
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# If port 0 is specified Redis will not listen on a TCP socket.
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port 6379
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```
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1. Set up password authentication (use the same password in all nodes)
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```conf
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requirepass "redis-password-goes-here"
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masterauth "redis-password-goes-here"
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```
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1. Restart the Redis services for the changes to take effect.
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**Configuring Slave Redis instance**
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1. Follow same instructions from master, with the extra change in `redis.conf`:
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```conf
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# IP and port of the master Redis server
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slaveof 10.10.10.10 6379
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```
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1. Restart the Redis services for the changes to take effect.
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#### Omnibus packages
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#### Omnibus packages
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You need to install the Omnibus GitLab package in `3` independent machines.
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You need to install the Omnibus GitLab package in `3` independent machines.
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@ -304,25 +250,16 @@ GitLab Enterprise Edition provides [automated way to setup and run](#sentinel-se
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#### Sentinel setup
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#### Sentinel setup
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##### Community Edition
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##### Community Edition
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With GitLab Community Edition, you need to install, configure, execute and
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With GitLab Community Edition, you need to install, configure, execute and
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monitor Sentinel from source. Omnibus GitLab Community Edition package does
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monitor Sentinel from source. Omnibus GitLab Community Edition package does
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not support Sentinel configuration.
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not support Sentinel configuration.
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A minimal configuration file (`sentinel.conf`) should contain the following:
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See documentation for Source Install [here](redis_source.md).
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```conf
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bind 0.0.0.0 # bind to all interfaces or change to a specific IP
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port 26379 # default sentinel port
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sentinel auth-pass gitlab-redis redis-password-goes-here
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sentinel monitor gitlab-redis 10.0.0.1 6379 2
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sentinel down-after-milliseconds gitlab-redis 10000
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sentinel config-epoch gitlab-redis 0
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sentinel leader-epoch gitlab-redis 0
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```
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##### Enterprise Edition
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##### Enterprise Edition
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To setup sentinel, you edit `/etc/gitlab/gitlab.rb` file:
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To setup sentinel, edit `/etc/gitlab/gitlab.rb` file:
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```ruby
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```ruby
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@ -336,7 +273,7 @@ redis_master_role['enable'] = true
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## Enabled Sentinel and Redis Slave services
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## Enabled Sentinel and Redis Slave services
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redis_sentinel_role['enable'] = true
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redis_sentinel_role['enable'] = true
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redis_master_role['enable'] = true
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redis_slave_role['enable'] = true
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## Configure Redis
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## Configure Redis
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redis['master_name'] = 'gitlab-redis' # must be the same in every sentinel node
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redis['master_name'] = 'gitlab-redis' # must be the same in every sentinel node
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@ -345,7 +282,7 @@ redis['master_port'] = 6379 # port of the initial master redis instance
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redis['master_password'] = 'redis-password-goes-here' # the same value defined in redis['password'] in the master instance
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redis['master_password'] = 'redis-password-goes-here' # the same value defined in redis['password'] in the master instance
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## Configure Sentinel
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## Configure Sentinel
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sentinel['bind'] = '0.0.0.0' # or specify an IP to bind to a single one
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# sentinel['bind'] = '0.0.0.0' # bind to all interfaces, uncomment to specify an IP and bind to a single one
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# sentinel['port'] = 26379 # uncomment to change default port
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# sentinel['port'] = 26379 # uncomment to change default port
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## Quorum must reflect the amount of voting sentinels it take to start a failover.
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## Quorum must reflect the amount of voting sentinels it take to start a failover.
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@ -435,24 +372,16 @@ master and the new sentinels servers.
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### GitLab setup
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### GitLab setup
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You can enable or disable sentinel support at any time in new or existing
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You can enable or disable Sentinel support at any time in new or existing
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installations. From the GitLab application perspective, all it requires is
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installations. From the GitLab application perspective, all it requires is
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the correct credentials for the master Redis and for all Sentinel nodes.
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the correct credentials for the Sentinel nodes.
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It doesn't require a list of all Sentinel nodes, as in case of a failure,
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While it doesn't require a list of all Sentinel nodes, in case of a failure,
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the application will need to query only one of them.
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it needs to access at one of listed ones.
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>**Note:**
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>**Note:**
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The following steps should be performed in the [GitLab application server](gitlab.md).
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The following steps should be performed in the [GitLab application server](gitlab.md)
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which ideally should not have Redis or Sentinels in the same machine for a HA setup.
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**For source based installations**
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1. Edit `/home/git/gitlab/config/resque.yml` following the example in
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`/home/git/gitlab/config/resque.yml.example`, and uncomment the sentinels
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line, changing to the correct server credentials.
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1. Restart GitLab for the changes to take effect.
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**For Omnibus installations**
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1. Edit `/etc/gitlab/gitlab.rb` and add/change the following lines:
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1. Edit `/etc/gitlab/gitlab.rb` and add/change the following lines:
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@ -466,7 +395,7 @@ The following steps should be performed in the [GitLab application server](gitla
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]
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]
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```
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```
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1. [Reconfigure] the GitLab for the changes to take effect.
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1. [Reconfigure] GitLab for the changes to take effect.
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## Troubleshooting
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## Troubleshooting
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@ -548,42 +477,6 @@ The way the redis connector `redis-rb` works with sentinel is a bit
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non-intuitive. We try to hide the complexity in omnibus, but it still requires
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non-intuitive. We try to hide the complexity in omnibus, but it still requires
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a few extra configs.
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a few extra configs.
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#### Install from Source
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If you get an error like: `Redis::CannotConnectError: No sentinels available.`,
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there may be something wrong with your configuration files or it can be related
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to [this issue][gh-531].
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It's a bit non-intuitive the way you have to config `resque.yml` and
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`sentinel.conf`, otherwise `redis-rb` will not work properly.
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The `master-group-name` ('gitlab-redis') defined in (`sentinel.conf`)
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**must** be used as the hostname in GitLab (`resque.yml` for source installations
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or `gitlab-rails['redis_*']` in Omnibus):
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```conf
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# sentinel.conf:
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sentinel monitor gitlab-redis 10.10.10.10 6379 2
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sentinel down-after-milliseconds gitlab-redis 10000
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sentinel config-epoch gitlab-redis 0
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sentinel leader-epoch gitlab-redis 0
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```
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```yaml
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# resque.yaml
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production:
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url: redis://:myredispassword@gitlab-redis/
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sentinels:
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-
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host: slave1.example.com # or use ip
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port: 26380 # point to sentinel, not to redis port
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-
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host: slave2.exampl.com # or use ip
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port: 26381 # point to sentinel, not to redis port
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```
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When in doubt, please read [Redis Sentinel documentation](http://redis.io/topics/sentinel)
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---
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---
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To make sure your configuration is correct:
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To make sure your configuration is correct:
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@ -611,8 +504,8 @@ To make sure your configuration is correct:
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1. To simulate a failover on master Redis, SSH into the Redis server and run:
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1. To simulate a failover on master Redis, SSH into the Redis server and run:
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```bash
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```bash
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# port must match your master redis port
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# port must match your master redis port, and the sleep time must be a few seconds bigger than defined one
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redis-cli -h localhost -p 6379 DEBUG sleep 60
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redis-cli -h localhost -p 6379 DEBUG sleep 20
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```
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```
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1. Then back in the Rails console from the first step, run:
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1. Then back in the Rails console from the first step, run:
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286
doc/administration/high_availability/redis_source.md
Normal file
286
doc/administration/high_availability/redis_source.md
Normal file
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@ -0,0 +1,286 @@
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# Configuring Redis for GitLab HA (Source Install)
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We highly recommend that you use Omnibus GitLab packages, as we can optimize
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required packages specifically for GitLab, and we will take care of upgrading
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to the latest supported version.
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If you are building packages for a specific distro, or trying to build some
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internal automation, you can check this documentation to learn about the
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minimal setup, required changes, etc.
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If you want to see the documentation for Omnibus GitLab Install, please [read it here](redis.md).
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<!-- START doctoc generated TOC please keep comment here to allow auto update -->
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<!-- DON'T EDIT THIS SECTION, INSTEAD RE-RUN doctoc TO UPDATE -->
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**Table of Contents**
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- [Configure your own Redis server](#configure-your-own-redis-server)
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- [Configuring Master Redis instance](#configuring-master-redis-instance)
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- [Configuring Slave Redis instances](#configuring-slave-redis-instances)
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- [Configuring Redis Sentinel instances](#configuring-redis-sentinel-instances)
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- [GitLab setup](#gitlab-setup)
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- [Example configurations](#example-configurations)
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- [Configuring Redis Master](#configuring-redis-master)
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- [Configuring Redis Slaves](#configuring-redis-slaves)
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- [Configuring Redis Sentinel](#configuring-redis-sentinel)
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- [Troubleshooting](#troubleshooting)
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<!-- END doctoc generated TOC please keep comment here to allow auto update -->
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## Configure your own Redis server
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Redis server must be configured to use TCP connection instead of socket,
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and since Redis `3.2`, you must define a password to receive external
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connections (`requirepass`).
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You will also need to define equal password for slave password definition
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(`masterauth`), in the same instance, if you are using Redis with Sentinel.
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To configure Redis to use TCP connection you need to define both
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`bind` and `port`. You can bind to all interfaces (`0.0.0.0`) or specify the
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ip of the desired interface (for ex. one from an internal network).
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### Configuring Master Redis instance
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You need to make the following changes in `redis.conf`:
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1. Define a `bind` address pointing to a local IP that your other machines
|
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can reach you. If you really need to bind to an external acessible IP, make
|
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|
sure you add extra firewall rules to prevent unauthorized access:
|
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|
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|
1. Define a `port` to force redis to listen on TCP so other machines can
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connect to it (default port is `6379`).
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1. Set up password authentication (use the same password in all nodes).
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The password should be defined equal for both `requirepass` and `masterauth`
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when setting up Redis to use with Sentinel.
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1. Restart the Redis services for the changes to take effect.
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See [example configuration](#configuring-redis-master) below.
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### Configuring Slave Redis instances
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1. Follow same instructions for Redis Master
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1. Define `slaveof` pointing to the Redis master instance with **IP** and **port**.
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1. Restart the Redis services for the changes to take effect.
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See [example configuration](#configuring-redis-slaves) below.
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### Configuring Redis Sentinel instances
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Sentinel is a special type of Redis server. It inherits most of the basic
|
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configuration options you can define in `redis.conf`, with specific ones
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starting with `sentinel` prefix.
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|
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You will need to define the initial configs to enable connectivity:
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|
|
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1. Define a `bind` address pointing to a local IP that your other machines
|
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can reach you. If you really need to bind to an external acessible IP, make
|
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|
sure you add extra firewall rules to prevent unauthorized access:
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|
|
||||||
|
1. Define a `port` to force sentinel to listen on TCP so other machines can
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connect to it (default port is `26379`).
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|
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And the sentinel specific ones:
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|
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1. Define with `sentinel auth-pass` the same shared password you have
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defined for both Redis **Master** and **Slaves** instances.
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1. Define with `sentinel monitor` the **IP** and **port** of the Redis
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**Master** node, and the **quorum** required to start a failover.
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If you need more information to understand about quorum, please
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read the detailed explanation in the [HA documentation for Omnibus Installs](redis.md).
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1. Define with `sentinel down-after-milliseconds` the ammount in `ms` of time
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that an unresponsive server will be considered down.
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1. Define a value for `sentinel failover_timeout` in `ms`. This has multiple
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meanings:
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* The time needed to re-start a failover after a previous failover was
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already tried against the same master by a given Sentinel, is two
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times the failover timeout.
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* The time needed for a slave replicating to a wrong master according
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to a Sentinel current configuration, to be forced to replicate
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with the right master, is exactly the failover timeout (counting since
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the moment a Sentinel detected the misconfiguration).
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* The time needed to cancel a failover that is already in progress but
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did not produced any configuration change (SLAVEOF NO ONE yet not
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acknowledged by the promoted slave).
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* The maximum time a failover in progress waits for all the slaves to be
|
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reconfigured as slaves of the new master. However even after this time
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the slaves will be reconfigured by the Sentinels anyway, but not with
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the exact parallel-syncs progression as specified.
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See [example configuration](#configuring-redis-sentinel) below.
|
||||||
|
|
||||||
|
## GitLab setup
|
||||||
|
|
||||||
|
You can enable or disable Sentinel support at any time in new or existing
|
||||||
|
installations. From the GitLab application perspective, all it requires is
|
||||||
|
the correct credentials for the Sentinel nodes.
|
||||||
|
|
||||||
|
While it doesn't require a list of all Sentinel nodes, in case of a failure,
|
||||||
|
it needs to access at one of listed ones.
|
||||||
|
|
||||||
|
>**Note:**
|
||||||
|
The following steps should be performed in the [GitLab application server](gitlab.md)
|
||||||
|
which ideally should not have Redis or Sentinels in the same machine for a HA setup.
|
||||||
|
|
||||||
|
1. Edit `/home/git/gitlab/config/resque.yml` following the example in
|
||||||
|
`/home/git/gitlab/config/resque.yml.example`, and uncomment the sentinels
|
||||||
|
lines, pointing to the correct server credentials.
|
||||||
|
|
||||||
|
1. Restart GitLab for the changes to take effect.
|
||||||
|
|
||||||
|
## Example configurations
|
||||||
|
|
||||||
|
In this example we consider that all servers have an internal network
|
||||||
|
interface with IPs in the `10.0.0.x` range, and that they can connect
|
||||||
|
to each other using these IPs.
|
||||||
|
|
||||||
|
In a real world usage, you would also setup firewall rules to prevent
|
||||||
|
unauthorized access from other machines, and block traffic from the
|
||||||
|
outside (Internet).
|
||||||
|
|
||||||
|
We will use the same `3` nodes with **Redis** + **Sentinel** topology
|
||||||
|
discussed in the [Configuring Redis for GitLab HA](redis.md) documentation.
|
||||||
|
|
||||||
|
Here is a list and description of each **machine** and the assined **ip**:
|
||||||
|
|
||||||
|
* `10.0.0.1`: Redis Master + Sentinel 1
|
||||||
|
* `10.0.0.2`: Redis Slave 1 + Sentinel 2
|
||||||
|
* `10.0.0.2`: Redis Slave 2 + Sentinel 3
|
||||||
|
|
||||||
|
Please note that after the initial configuration, if a failover is initiated
|
||||||
|
by the Sentinel nodes, the Redis nodes will be reconfigured and the **Master**
|
||||||
|
will change permanently (including in `redis.conf`) from one node to the other,
|
||||||
|
until a new failover is initiated again.
|
||||||
|
|
||||||
|
The same thing will happen with `sentinel.conf` that will be overriten after the
|
||||||
|
initial execution, after any new sentinel node starts watching the **Master**,
|
||||||
|
or a failover promotes a different **Master** node.
|
||||||
|
|
||||||
|
### Configuring Redis Master
|
||||||
|
|
||||||
|
`redis.conf`:
|
||||||
|
|
||||||
|
```conf
|
||||||
|
bind 10.0.0.1
|
||||||
|
port 6379
|
||||||
|
requirepass redis-password-goes-here
|
||||||
|
masterauth redis-password-goes-here
|
||||||
|
```
|
||||||
|
|
||||||
|
### Configuring Redis Slaves
|
||||||
|
|
||||||
|
**Slave 1 - `redis.conf`:**
|
||||||
|
|
||||||
|
```conf
|
||||||
|
bind 10.0.0.2
|
||||||
|
port 6379
|
||||||
|
requirepass redis-password-goes-here
|
||||||
|
masterauth redis-password-goes-here
|
||||||
|
|
||||||
|
# IP and port of the master Redis server
|
||||||
|
slaveof 10.0.0.1 6379
|
||||||
|
```
|
||||||
|
|
||||||
|
**Slave 2 - `redis.conf`:**
|
||||||
|
|
||||||
|
```conf
|
||||||
|
bind 10.0.0.3
|
||||||
|
port 6379
|
||||||
|
requirepass redis-password-goes-here
|
||||||
|
masterauth redis-password-goes-here
|
||||||
|
|
||||||
|
# IP and port of the master Redis server
|
||||||
|
slaveof 10.0.0.1 6379
|
||||||
|
```
|
||||||
|
|
||||||
|
### Configuring Redis Sentinel
|
||||||
|
|
||||||
|
For this example, **Sentinel 1** will be configured in the same machine as the
|
||||||
|
**Redis Master**, **Sentinel 2** and **Sentinel 3** in the same machines as the
|
||||||
|
**Slave 1** and **Slave 2** respectively.
|
||||||
|
|
||||||
|
Sentinel 1 - `sentinel.conf`
|
||||||
|
|
||||||
|
```conf
|
||||||
|
bind 10.0.0.1
|
||||||
|
port 26379
|
||||||
|
sentinel auth-pass gitlab-redis redis-password-goes-here
|
||||||
|
sentinel monitor gitlab-redis 10.0.0.1 6379 2
|
||||||
|
sentinel down-after-milliseconds gitlab-redis 10000
|
||||||
|
sentinel failover_timeout 30000
|
||||||
|
```
|
||||||
|
|
||||||
|
Sentinel 2 - `sentinel.conf`
|
||||||
|
|
||||||
|
```conf
|
||||||
|
bind 10.0.0.2
|
||||||
|
port 26379
|
||||||
|
sentinel auth-pass gitlab-redis redis-password-goes-here
|
||||||
|
sentinel monitor gitlab-redis 10.0.0.1 6379 2
|
||||||
|
sentinel down-after-milliseconds gitlab-redis 10000
|
||||||
|
sentinel failover_timeout 30000
|
||||||
|
```
|
||||||
|
|
||||||
|
Sentinel 3 - `sentinel.conf`
|
||||||
|
|
||||||
|
```conf
|
||||||
|
bind 10.0.0.3
|
||||||
|
port 26379
|
||||||
|
sentinel auth-pass gitlab-redis redis-password-goes-here
|
||||||
|
sentinel monitor gitlab-redis 10.0.0.1 6379 2
|
||||||
|
sentinel down-after-milliseconds gitlab-redis 10000
|
||||||
|
sentinel failover_timeout 30000
|
||||||
|
```
|
||||||
|
|
||||||
|
## Troubleshooting
|
||||||
|
|
||||||
|
We have a more detailed [Troubleshooting](redis.md#troubleshooting) explained in the documentation for Omnibus
|
||||||
|
Install. Here we will list only the things that are specific to a **Source** install.
|
||||||
|
|
||||||
|
If you get an error in GitLab like: `Redis::CannotConnectError: No sentinels available.`,
|
||||||
|
there may be something wrong with your configuration files or it can be related
|
||||||
|
to [this issue][gh-531].
|
||||||
|
|
||||||
|
It's a bit non-intuitive the way you have to config `resque.yml` and
|
||||||
|
`sentinel.conf`, otherwise `redis-rb` will not work properly.
|
||||||
|
|
||||||
|
The `master-group-name` ('gitlab-redis') defined in (`sentinel.conf`)
|
||||||
|
**must** be used as the hostname in GitLab (`resque.yml`):
|
||||||
|
|
||||||
|
```conf
|
||||||
|
# sentinel.conf:
|
||||||
|
sentinel monitor gitlab-redis 10.0.0.1 6379 2
|
||||||
|
sentinel down-after-milliseconds gitlab-redis 10000
|
||||||
|
sentinel config-epoch gitlab-redis 0
|
||||||
|
sentinel leader-epoch gitlab-redis 0
|
||||||
|
```
|
||||||
|
|
||||||
|
```yaml
|
||||||
|
# resque.yaml
|
||||||
|
production:
|
||||||
|
url: redis://:myredispassword@gitlab-redis/
|
||||||
|
sentinels:
|
||||||
|
-
|
||||||
|
host: 10.0.0.1
|
||||||
|
port: 26379 # point to sentinel, not to redis port
|
||||||
|
-
|
||||||
|
host: 10.0.0.2
|
||||||
|
port: 26379 # point to sentinel, not to redis port
|
||||||
|
-
|
||||||
|
host: 10.0.0.3
|
||||||
|
port: 26379 # point to sentinel, not to redis port
|
||||||
|
```
|
||||||
|
|
||||||
|
When in doubt, please read [Redis Sentinel documentation](http://redis.io/topics/sentinel)
|
Loading…
Reference in a new issue