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Small changes to storage driver/commands ref

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Signed-off-by: Mary Anthony <mary@docker.com>
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Mary Anthony 2015-11-18 16:32:23 -08:00
parent 249b3a9479
commit 9941d5bc33
3 changed files with 20 additions and 18 deletions
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4
docs/reference/commandline/index.md
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@ -1,6 +1,6 @@
<!-- [metadata]>
+++
title = "Using the command line"
title = "Docker Engine Commands"
description = "Docker's CLI command description and usage"
keywords = ["Docker, Docker documentation, CLI, command line"]
[menu.main]
@ -12,7 +12,7 @@ parent = "mn_reference"
# The Docker commands
This section contains reference information on using Docker's command line client. Each command has a reference page along with samples. If you are unfamiliar with the command line, you should start by reading about how to ["Use the Docker command line"](cli.md).
This section contains reference information on using Docker's command line client. Each command has a reference page along with samples. If you are unfamiliar with the command line, you should start by reading about how to [Use the Docker command line](cli.md).
You start the Docker daemon with the command line. How you start the daemon affects your Docker containers. For that reason you should also make sure to read the [`daemon`](daemon.md) reference page.

22
docs/userguide/storagedriver/device-mapper-driver.md
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@ -210,18 +210,20 @@ The procedure below will create a 90GB data volume and 4GB metadata volume to us
5. Start the Docker daemon with the `devicemapper` storage driver and the `--storage-opt` flags.
The `data` and `metadata` devices that you pass to the `--storage-opt` options were created in the previous steps.
The `data` and `metadata` devices that you pass to the `--storage-opt` options were created in the previous steps.
$ sudo docker daemon --storage-driver=devicemapper --storage-opt dm.datadev=/dev/vg-docker/data --storage-opt dm.metadatadev=/dev/vg-docker/metadata &
[1] 2163
[root@ip-10-0-0-75 centos]# INFO[0000] Listening for HTTP on unix (/var/run/docker.sock)
INFO[0027] Option DefaultDriver: bridge
INFO[0027] Option DefaultNetwork: bridge
<output truncated>
INFO[0027] Daemon has completed initialization
INFO[0027] Docker daemon commit=0a8c2e3 execdriver=native-0.2 graphdriver=devicemapper version=1.8.2
$ sudo docker daemon --storage-driver=devicemapper --storage-opt dm.datadev=/dev/vg-docker/data --storage-opt dm.metadatadev=/dev/vg-docker/metadata &
[1] 2163
[root@ip-10-0-0-75 centos]# INFO[0000] Listening for HTTP on unix (/var/run/docker.sock)
INFO[0027] Option DefaultDriver: bridge
INFO[0027] Option DefaultNetwork: bridge
<output truncated>
INFO[0027] Daemon has completed initialization
INFO[0027] Docker daemon commit=0a8c2e3 execdriver=native-0.2 graphdriver=devicemapper version=1.8.2
It is also possible to set the `--storage-driver` and `--storage-opt` flags in the Docker config file and start the daemon normally using the `service` or `systemd` commands.
It is also possible to set the `--storage-driver` and `--storage-opt` flags in
the Docker config file and start the daemon normally using the `service` or
`systemd` commands.
6. Use the `docker info` command to verify that the daemon is using `data` and `metadata` devices you created.

12
docs/userguide/storagedriver/zfs-driver.md
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@ -137,7 +137,7 @@ Once ZFS is installed and loaded, you're ready to configure ZFS for Docker.
$ sudo zpool create -f zpool-docker /dev/xvdb
The command creates the `zpool` and gives it the name "zpool-docker". The name is arbitrary.
The command creates the `zpool` and gives it the name "zpool-docker". The name is arbitrary.
2. Check that the `zpool` exists.
@ -156,7 +156,7 @@ Once ZFS is installed and loaded, you're ready to configure ZFS for Docker.
zpool-docker 93.5K 3.84G 19K /zpool-docker
zpool-docker/docker 19K 3.84G 19K /var/lib/docker
Now that you have a ZFS filesystem mounted to `/var/lib/docker`, the daemon should automatically load with the `zfs` storage driver.
Now that you have a ZFS filesystem mounted to `/var/lib/docker`, the daemon should automatically load with the `zfs` storage driver.
5. Start the Docker daemon.
@ -185,9 +185,9 @@ Once ZFS is installed and loaded, you're ready to configure ZFS for Docker.
Execution Driver: native-0.2
[...]
The output of the command above shows that the Docker daemon is using the
`zfs` storage driver and that the parent dataset is the `zpool-docker/docker`
filesystem created earlier.
The output of the command above shows that the Docker daemon is using the
`zfs` storage driver and that the parent dataset is the `zpool-docker/docker`
filesystem created earlier.
Your Docker host is now using ZFS to store to manage its images and containers.
@ -207,7 +207,7 @@ using them with ZFS.
* **ZFS Caching**. ZFS caches disk blocks in a memory structure called the adaptive replacement cache (ARC). The *Single Copy ARC* feature of ZFS allows a single cached copy of a block to be shared by multiple clones of a filesystem. This means that multiple running containers can share a single copy of cached block. This means that ZFS is a good option for PaaS and other high density use cases.
- **Fragmentation**. Fragmentation is a natural byproduct of copy-on-write filesystems like ZFS. However, ZFS writes in 128K blocks and allocates *slabs* (multiple 128K blocks) to CoW operations in an attempt to reduce fragmentation. The ZFS intent log (ZIL) and the coalescing of writes (delayed writes) also help to reduce fragmentation.
- **Fragmentation**. Fragmentation is a natural byproduct of copy-on-write filesystems like ZFS. However, ZFS writes in 128K blocks and allocates *slabs* (multiple 128K blocks) to CoW operations in an attempt to reduce fragmentation. The ZFS intent log (ZIL) and the coalescing of writes (delayed writes) also help to reduce fragmentation.
- **Use the native ZFS driver for Linux**. Although the Docker `zfs` storage driver supports the ZFS FUSE implementation, it is not recommended when high performance is required. The native ZFS on Linux driver tends to perform better than the FUSE implementation.