Merge pull request #16801 from aidanhs/aphs-add-socat-t
Update ambassador image, use the socat -t option
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commit
b826215c57
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@ -81,42 +81,43 @@ On the Docker host (192.168.1.52) that Redis will run on:
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^D
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^D
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# add redis ambassador
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# add redis ambassador
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$ docker run -t -i --link redis:redis --name redis_ambassador -p 6379:6379 busybox sh
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$ docker run -t -i --link redis:redis --name redis_ambassador -p 6379:6379 alpine:3.2 sh
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In the `redis_ambassador` container, you can see the linked Redis
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In the `redis_ambassador` container, you can see the linked Redis
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containers `env`:
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containers `env`:
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$ env
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/ # env
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REDIS_PORT=tcp://172.17.0.136:6379
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REDIS_PORT=tcp://172.17.0.136:6379
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REDIS_PORT_6379_TCP_ADDR=172.17.0.136
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REDIS_PORT_6379_TCP_ADDR=172.17.0.136
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REDIS_NAME=/redis_ambassador/redis
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REDIS_NAME=/redis_ambassador/redis
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HOSTNAME=19d7adf4705e
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HOSTNAME=19d7adf4705e
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SHLVL=1
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HOME=/root
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REDIS_PORT_6379_TCP_PORT=6379
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REDIS_PORT_6379_TCP_PORT=6379
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HOME=/
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REDIS_PORT_6379_TCP_PROTO=tcp
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REDIS_PORT_6379_TCP_PROTO=tcp
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container=lxc
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REDIS_PORT_6379_TCP=tcp://172.17.0.136:6379
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REDIS_PORT_6379_TCP=tcp://172.17.0.136:6379
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TERM=xterm
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TERM=xterm
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PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
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PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
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PWD=/
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PWD=/
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/ # exit
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This environment is used by the ambassador `socat` script to expose Redis
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This environment is used by the ambassador `socat` script to expose Redis
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to the world (via the `-p 6379:6379` port mapping):
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to the world (via the `-p 6379:6379` port mapping):
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$ docker rm redis_ambassador
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$ docker rm redis_ambassador
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$ sudo ./contrib/mkimage-unittest.sh
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$ CMD="apk update && apk add socat && sh"
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$ docker run -t -i --link redis:redis --name redis_ambassador -p 6379:6379 docker-ut sh
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$ docker run -t -i --link redis:redis --name redis_ambassador -p 6379:6379 alpine:3.2 sh -c "$CMD"
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[...]
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$ socat TCP4-LISTEN:6379,fork,reuseaddr TCP4:172.17.0.136:6379
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/ # socat -t 100000000 TCP4-LISTEN:6379,fork,reuseaddr TCP4:172.17.0.136:6379
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Now ping the Redis server via the ambassador:
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Now ping the Redis server via the ambassador:
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Now go to a different server:
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Now go to a different server:
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$ sudo ./contrib/mkimage-unittest.sh
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$ CMD="apk update && apk add socat && sh"
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$ docker run -t -i --expose 6379 --name redis_ambassador docker-ut sh
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$ docker run -t -i --expose 6379 --name redis_ambassador alpine:3.2 sh -c "$CMD"
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[...]
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$ socat TCP4-LISTEN:6379,fork,reuseaddr TCP4:192.168.1.52:6379
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/ # socat -t 100000000 TCP4-LISTEN:6379,fork,reuseaddr TCP4:192.168.1.52:6379
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And get the `redis-cli` image so we can talk over the ambassador bridge.
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And get the `redis-cli` image so we can talk over the ambassador bridge.
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@ -127,8 +128,8 @@ And get the `redis-cli` image so we can talk over the ambassador bridge.
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## The svendowideit/ambassador Dockerfile
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## The svendowideit/ambassador Dockerfile
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The `svendowideit/ambassador` image is a small `busybox` image with
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The `svendowideit/ambassador` image is based on the `alpine:3.2` image with
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`socat` built in. When you start the container, it uses a small `sed`
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`socat` installed. When you start the container, it uses a small `sed`
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script to parse out the (possibly multiple) link environment variables
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script to parse out the (possibly multiple) link environment variables
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to set up the port forwarding. On the remote host, you need to set the
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to set up the port forwarding. On the remote host, you need to set the
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variable using the `-e` command line option.
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variable using the `-e` command line option.
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@ -139,19 +140,21 @@ Will forward the local `1234` port to the remote IP and port, in this
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case `192.168.1.52:6379`.
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case `192.168.1.52:6379`.
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#
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#
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#
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# do
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# first you need to build the docker-ut image
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# docker build -t svendowideit/ambassador .
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# using ./contrib/mkimage-unittest.sh
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# then
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# docker build -t SvenDowideit/ambassador .
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# docker tag SvenDowideit/ambassador ambassador
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# then to run it (on the host that has the real backend on it)
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# then to run it (on the host that has the real backend on it)
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# docker run -t -i --link redis:redis --name redis_ambassador -p 6379:6379 ambassador
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# docker run -t -i -link redis:redis -name redis_ambassador -p 6379:6379 svendowideit/ambassador
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# on the remote host, you can set up another ambassador
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# on the remote host, you can set up another ambassador
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# docker run -t -i --name redis_ambassador --expose 6379 sh
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# docker run -t -i -name redis_ambassador -expose 6379 -e REDIS_PORT_6379_TCP=tcp://192.168.1.52:6379 svendowideit/ambassador sh
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# you can read more about this process at https://docs.docker.com/articles/ambassador_pattern_linking/
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FROM docker-ut
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# use alpine because its a minimal image with a package manager.
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# prettymuch all that is needed is a container that has a functioning env and socat (or equivalent)
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FROM alpine:3.2
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MAINTAINER SvenDowideit@home.org.au
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MAINTAINER SvenDowideit@home.org.au
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RUN apk update && \
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apk add socat && \
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rm -r /var/cache/
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CMD env | grep _TCP= | sed 's/.*_PORT_\([0-9]*\)_TCP=tcp:\/\/\(.*\):\(.*\)/socat TCP4-LISTEN:\1,fork,reuseaddr TCP4:\2:\3 \&/' | sh && top
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CMD env | grep _TCP= | sed 's/.*_PORT_\([0-9]*\)_TCP=tcp:\/\/\(.*\):\(.*\)/socat -t 100000000 TCP4-LISTEN:\1,fork,reuseaddr TCP4:\2:\3 \& wait/' | sh
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@ -78,18 +78,20 @@ the `Using cache` message in the console output.
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(For more information, see the [Build cache section](../articles/dockerfile_best-practices.md#build-cache)) in the
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(For more information, see the [Build cache section](../articles/dockerfile_best-practices.md#build-cache)) in the
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`Dockerfile` best practices guide:
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`Dockerfile` best practices guide:
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$ docker build -t SvenDowideit/ambassador .
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$ docker build -t svendowideit/ambassador .
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Uploading context 10.24 kB
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Sending build context to Docker daemon 15.36 kB
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Uploading context
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Step 0 : FROM alpine:3.2
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Step 1 : FROM docker-ut
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---> 31f630c65071
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---> cbba202fe96b
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Step 1 : MAINTAINER SvenDowideit@home.org.au
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Step 2 : MAINTAINER SvenDowideit@home.org.au
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---> Using cache
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---> Using cache
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---> 51182097be13
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---> 2a1c91448f5f
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Step 3 : CMD env | grep _TCP= | sed 's/.*_PORT_\([0-9]*\)_TCP=tcp:\/\/\(.*\):\(.*\)/socat TCP4-LISTEN:\1,fork,reuseaddr TCP4:\2:\3 \&/' | sh && top
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Step 2 : RUN apk update && apk add socat && rm -r /var/cache/
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---> Using cache
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---> Using cache
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---> 1a5ffc17324d
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---> 21ed6e7fbb73
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Successfully built 1a5ffc17324d
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Step 3 : CMD env | grep _TCP= | sed 's/.*_PORT_\([0-9]*\)_TCP=tcp:\/\/\(.*\):\(.*\)/socat -t 100000000 TCP4-LISTEN:\1,fork,reuseaddr TCP4:\2:\3 \& wait/' | sh
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---> Using cache
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---> 7ea8aef582cc
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Successfully built 7ea8aef582cc
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When you're done with your build, you're ready to look into [*Pushing a
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When you're done with your build, you're ready to look into [*Pushing a
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repository to its registry*](../userguide/dockerrepos.md#contributing-to-docker-hub).
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repository to its registry*](../userguide/dockerrepos.md#contributing-to-docker-hub).
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