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@@ -9,12 +9,14 @@ Linking Redis
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.. include:: example_header.inc
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.. include:: example_header.inc
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-Building a redis container to link as a child of our web application.
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+Building a Redis container to link as a child of our web application.
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-Building the redis container
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+Building the Redis container
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----------------------------
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----------------------------
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-Lets build a redis image with the following Dockerfile.
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+Lets build a Redis image with the following Dockerfile.
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+
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+First checkout the Redis source code.
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.. code-block:: bash
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.. code-block:: bash
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@@ -22,7 +24,10 @@ Lets build a redis image with the following Dockerfile.
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cd redis
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cd redis
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git checkout 2.6
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git checkout 2.6
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- # Save this Dockerfile to the root of the redis repository.
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+
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+Now let's create a Dockerfile in the root of the Redis repository.
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+
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+.. code-block:: bash
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# Build redis from source
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# Build redis from source
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# Make sure you have the redis source code checked out in
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# Make sure you have the redis source code checked out in
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@@ -51,37 +56,37 @@ Lets build a redis image with the following Dockerfile.
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We need to ``EXPOSE`` the default port of 6379 so that our link knows what ports
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We need to ``EXPOSE`` the default port of 6379 so that our link knows what ports
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-to connect to our redis container on. If you do not expose any ports for the
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+to connect to our Redis container on. If you do not expose any ports for the
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image then docker will not be able to establish the link between containers.
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image then docker will not be able to establish the link between containers.
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-Run the redis container
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+Run the Redis container
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-----------------------
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-----------------------
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.. code-block:: bash
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.. code-block:: bash
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-
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- docker run -d -e PASSWORD=docker -name redis redis-2.6 --requirepass docker
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-
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-This will run our redis container with the password docker
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+
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+ sudo docker run -d -e PASSWORD=docker -name redis redis-2.6 --requirepass docker
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+
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+This will run our Redis container with the password docker
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to secure our service. By specifying the ``-name`` flag on run
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to secure our service. By specifying the ``-name`` flag on run
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-we will assign the name ``redis`` to this container. If we do not specify a name for
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+we will assign the name ``redis`` to this container. If we do not specify a name for
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our container via the ``-name`` flag docker will automatically generate a name for us.
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our container via the ``-name`` flag docker will automatically generate a name for us.
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We can issue all the commands that you would expect; start, stop, attach, using the name for our container.
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We can issue all the commands that you would expect; start, stop, attach, using the name for our container.
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The name also allows us to link other containers into this one.
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The name also allows us to link other containers into this one.
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-Linking redis as a child
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+Linking Redis as a child
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------------------------
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------------------------
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-Next we can start a new web application that has a dependency on redis and apply a link
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-to connect both containers. If you noticed when running our redis server we did not use
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-the ``-p`` flag to publish the redis port to the host system. Redis exposed port 6379 via the Dockerfile
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+Next we can start a new web application that has a dependency on Redis and apply a link
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+to connect both containers. If you noticed when running our Redis server we did not use
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+the ``-p`` flag to publish the Redis port to the host system. Redis exposed port 6379 via the Dockerfile
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and this is all we need to establish a link.
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and this is all we need to establish a link.
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-Now lets start our web application with a link into redis.
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+Now let's start our web application with a link into Redis.
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.. code-block:: bash
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.. code-block:: bash
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-
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- docker run -t -i -link redis:db -name webapp ubuntu bash
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+
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+ sudo docker run -t -i -link redis:db -name webapp ubuntu bash
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root@4c01db0b339c:/# env
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root@4c01db0b339c:/# env
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@@ -105,7 +110,7 @@ Now lets start our web application with a link into redis.
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When we inspect the environment of the linked container we can see a few extra environment
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When we inspect the environment of the linked container we can see a few extra environment
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variables have been added. When you specified ``-link redis:db`` you are telling docker
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variables have been added. When you specified ``-link redis:db`` you are telling docker
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-to link the container named ``redis`` into this new container with the alias ``db``.
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+to link the container named ``redis`` into this new container with the alias ``db``.
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Environment variables are prefixed with the alias so that the parent container can access
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Environment variables are prefixed with the alias so that the parent container can access
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network and environment information from the containers that are linked into it.
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network and environment information from the containers that are linked into it.
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@@ -128,5 +133,5 @@ network and environment information from the containers that are linked into it.
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Accessing the network information along with the environment of the child container allows
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Accessing the network information along with the environment of the child container allows
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-us to easily connect to the redis service on the specific ip and port and use the password
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+us to easily connect to the Redis service on the specific IP and port and use the password
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specified in the environment.
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specified in the environment.
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