Improve the way we deliver Examples in command line. (Add descriptive titles)
Signed-off-by: Jian Zhang <zhangjian.fnst@cn.fujitsu.com>
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Jian Zhang
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@ -128,6 +128,8 @@ See also:
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## Examples
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### Build with PATH
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$ docker build .
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Uploading context 10240 bytes
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Step 1 : FROM busybox
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@ -168,6 +170,31 @@ The transfer of context from the local machine to the Docker daemon is what the
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If you wish to keep the intermediate containers after the build is complete,
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you must use `--rm=false`. This does not affect the build cache.
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### Build with URL
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$ docker build github.com/creack/docker-firefox
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This will clone the GitHub repository and use the cloned repository as context.
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The Dockerfile at the root of the repository is used as Dockerfile. Note that
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you can specify an arbitrary Git repository by using the `git://` or `git@`
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schema.
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### Build with -
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$ docker build - < Dockerfile
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This will read a Dockerfile from `STDIN` without context. Due to the lack of a
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context, no contents of any local directory will be sent to the Docker daemon.
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Since there is no context, a Dockerfile `ADD` only works if it refers to a
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remote URL.
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$ docker build - < context.tar.gz
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This will build an image for a compressed context read from `STDIN`. Supported
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formats are: bzip2, gzip and xz.
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### Usage of .dockerignore
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$ docker build .
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Uploading context 18.829 MB
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Uploading context
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@ -193,29 +220,14 @@ directory from the context. Its effect can be seen in the changed size of the
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uploaded context. The builder reference contains detailed information on
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[creating a .dockerignore file](../builder.md#dockerignore-file)
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### Tag image (-t)
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$ docker build -t vieux/apache:2.0 .
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This will build like the previous example, but it will then tag the resulting
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image. The repository name will be `vieux/apache` and the tag will be `2.0`
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$ docker build - < Dockerfile
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This will read a Dockerfile from `STDIN` without context. Due to the lack of a
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context, no contents of any local directory will be sent to the Docker daemon.
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Since there is no context, a Dockerfile `ADD` only works if it refers to a
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remote URL.
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$ docker build - < context.tar.gz
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This will build an image for a compressed context read from `STDIN`. Supported
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formats are: bzip2, gzip and xz.
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$ docker build github.com/creack/docker-firefox
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This will clone the GitHub repository and use the cloned repository as context.
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The Dockerfile at the root of the repository is used as Dockerfile. Note that
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you can specify an arbitrary Git repository by using the `git://` or `git@`
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schema.
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### Specify Dockerfile (-f)
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$ docker build -f Dockerfile.debug .
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@ -248,14 +260,20 @@ the command line.
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> repeatable builds on remote Docker hosts. This is also the reason why
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> `ADD ../file` will not work.
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### Optional parent cgroup (--cgroup-parent)
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When `docker build` is run with the `--cgroup-parent` option the containers
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used in the build will be run with the [corresponding `docker run`
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flag](../run.md#specifying-custom-cgroups).
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### Set ulimits in container (--ulimit)
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Using the `--ulimit` option with `docker build` will cause each build step's
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container to be started using those [`--ulimit`
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flag values](../run.md#setting-ulimits-in-a-container).
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### Set build-time variables (--build-arg)
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You can use `ENV` instructions in a Dockerfile to define variable
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values. These values persist in the built image. However, often
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persistence is not what you want. Users want to specify variables differently
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@ -263,7 +281,7 @@ depending on which host they build an image on.
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A good example is `http_proxy` or source versions for pulling intermediate
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files. The `ARG` instruction lets Dockerfile authors define values that users
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can set at build-time using the `---build-arg` flag:
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can set at build-time using the `--build-arg` flag:
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$ docker build --build-arg HTTP_PROXY=http://10.20.30.2:1234 .
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@ -92,6 +92,8 @@ and linking containers.
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## Examples
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### Assign name and allocate psuedo-TTY (--name, -it)
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$ docker run --name test -it debian
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root@d6c0fe130dba:/# exit 13
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$ echo $?
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@ -106,6 +108,8 @@ In the example, the `bash` shell is quit by entering
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`exit 13`. This exit code is passed on to the caller of
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`docker run`, and is recorded in the `test` container's metadata.
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### Capture container ID (--cidfile)
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$ docker run --cidfile /tmp/docker_test.cid ubuntu echo "test"
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This will create a container and print `test` to the console. The `cidfile`
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@ -113,6 +117,8 @@ flag makes Docker attempt to create a new file and write the container ID to it.
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If the file exists already, Docker will return an error. Docker will close this
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file when `docker run` exits.
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### Full container capabilities (--privileged)
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$ docker run -t -i --rm ubuntu bash
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root@bc338942ef20:/# mount -t tmpfs none /mnt
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mount: permission denied
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@ -132,11 +138,15 @@ lifts all the limitations enforced by the `device` cgroup controller. In other
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words, the container can then do almost everything that the host can do. This
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flag exists to allow special use-cases, like running Docker within Docker.
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### Set working directory (-w)
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$ docker run -w /path/to/dir/ -i -t ubuntu pwd
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The `-w` lets the command being executed inside directory given, here
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`/path/to/dir/`. If the path does not exists it is created inside the container.
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### Mount volume (-v, --read-only)
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$ docker run -v `pwd`:`pwd` -w `pwd` -i -t ubuntu pwd
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The `-v` flag mounts the current working directory into the container. The `-w`
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@ -166,6 +176,8 @@ binary (such as that provided by [https://get.docker.com](
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https://get.docker.com)), you give the container the full access to create and
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manipulate the host's Docker daemon.
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### Publish or expose port (-p, --expose)
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$ docker run -p 127.0.0.1:80:8080 ubuntu bash
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This binds port `8080` of the container to port `80` on `127.0.0.1` of
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@ -179,6 +191,8 @@ publishing the port to the host system's interfaces. The [Docker User
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Guide](../../userguide/dockerlinks.md) explains in detail how to manipulate
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ports in Docker.
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### Set environment variables (-e, --env, --env-file)
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$ docker run -e MYVAR1 --env MYVAR2=foo --env-file ./env.list ubuntu bash
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This sets environmental variables in the container. For illustration all three
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@ -247,7 +261,9 @@ An example of a file passed with `--env-file`
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123qwe=bar
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org.spring.config=something
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A label is a a `key=value` pair that applies metadata to a container. To label a container with two labels:
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### Set metadata on container (-l, --label, --label-file)
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A label is a `key=value` pair that applies metadata to a container. To label a container with two labels:
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$ docker run -l my-label --label com.example.foo=bar ubuntu bash
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@ -281,6 +297,8 @@ For additional information on working with labels, see [*Labels - custom
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metadata in Docker*](../../userguide/labels-custom-metadata.md) in the Docker User
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Guide.
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### Add link to another container (--link)
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$ docker run --link /redis:redis --name console ubuntu bash
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The `--link` flag will link the container named `/redis` into the newly
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@ -295,6 +313,8 @@ example as:
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The `--name` flag will assign the name `console` to the newly created
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container.
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### Mount volumes from container (--volumes-from)
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$ docker run --volumes-from 777f7dc92da7 --volumes-from ba8c0c54f0f2:ro -i -t ubuntu pwd
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The `--volumes-from` flag mounts all the defined volumes from the referenced
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@ -317,6 +337,8 @@ content label. Shared volume labels allow all containers to read/write content.
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The `Z` option tells Docker to label the content with a private unshared label.
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Only the current container can use a private volume.
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### Attach to STDIN/STDOUT/STDERR (-a)
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The `-a` flag tells `docker run` to bind to the container's `STDIN`, `STDOUT`
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or `STDERR`. This makes it possible to manipulate the output and input as
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needed.
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@ -340,6 +362,8 @@ logs could be retrieved using `docker logs`. This is
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useful if you need to pipe a file or something else into a container and
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retrieve the container's ID once the container has finished running.
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### Add host device to container (--device)
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$ docker run --device=/dev/sdc:/dev/xvdc --device=/dev/sdd --device=/dev/zero:/dev/nulo -i -t ubuntu ls -l /dev/{xvdc,sdd,nulo}
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brw-rw---- 1 root disk 8, 2 Feb 9 16:05 /dev/xvdc
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brw-rw---- 1 root disk 8, 3 Feb 9 16:05 /dev/sdd
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@ -375,38 +399,7 @@ flag:
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> that may be removed should not be added to untrusted containers with
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> `--device`.
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**A complete example:**
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$ docker run -d --name static static-web-files sh
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$ docker run -d --expose=8098 --name riak riakserver
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$ docker run -d -m 100m -e DEVELOPMENT=1 -e BRANCH=example-code -v $(pwd):/app/bin:ro --name app appserver
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$ docker run -d -p 1443:443 --dns=10.0.0.1 --dns-search=dev.org -v /var/log/httpd --volumes-from static --link riak --link app -h www.sven.dev.org --name web webserver
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$ docker run -t -i --rm --volumes-from web -w /var/log/httpd busybox tail -f access.log
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This example shows five containers that might be set up to test a web
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application change:
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1. Start a pre-prepared volume image `static-web-files` (in the background)
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that has CSS, image and static HTML in it, (with a `VOLUME` instruction in
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the Dockerfile to allow the web server to use those files);
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2. Start a pre-prepared `riakserver` image, give the container name `riak` and
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expose port `8098` to any containers that link to it;
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3. Start the `appserver` image, restricting its memory usage to 100MB, setting
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two environment variables `DEVELOPMENT` and `BRANCH` and bind-mounting the
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current directory (`$(pwd)`) in the container in read-only mode as `/app/bin`;
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4. Start the `webserver`, mapping port `443` in the container to port `1443` on
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the Docker server, setting the DNS server to `10.0.0.1` and DNS search
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domain to `dev.org`, creating a volume to put the log files into (so we can
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access it from another container), then importing the files from the volume
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exposed by the `static` container, and linking to all exposed ports from
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`riak` and `app`. Lastly, we set the hostname to `web.sven.dev.org` so its
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consistent with the pre-generated SSL certificate;
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5. Finally, we create a container that runs `tail -f access.log` using the logs
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volume from the `web` container, setting the workdir to `/var/log/httpd`. The
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`--rm` option means that when the container exits, the container's layer is
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removed.
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## Restart policies
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### Restart policies (--restart)
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Use Docker's `--restart` to specify a container's *restart policy*. A restart
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policy controls whether the Docker daemon restarts a container after exit.
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@ -468,7 +461,7 @@ More detailed information on restart policies can be found in the
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[Restart Policies (--restart)](../run.md#restart-policies-restart)
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section of the Docker run reference page.
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## Adding entries to a container hosts file
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### Add entries to container hosts file (--add-host)
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You can add other hosts into a container's `/etc/hosts` file by using one or
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more `--add-host` flags. This example adds a static address for a host named
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@ -499,7 +492,7 @@ For IPv6 use the `-6` flag instead of the `-4` flag. For other network
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devices, replace `eth0` with the correct device name (for example `docker0`
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for the bridge device).
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### Setting ulimits in a container
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### Set ulimits in container (--ulimit)
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Since setting `ulimit` settings in a container requires extra privileges not
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available in the default container, you can set these using the `--ulimit` flag.
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@ -519,13 +512,12 @@ available in the default container, you can set these using the `--ulimit` flag.
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The values are sent to the appropriate `syscall` as they are set.
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Docker doesn't perform any byte conversion. Take this into account when setting the values.
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#### For `nproc` usage:
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#### For `nproc` usage
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Be careful setting `nproc` with the `ulimit` flag as `nproc` is designed by Linux to set the
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maximum number of processes available to a user, not to a container. For example, start four
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containers with `daemon` user:
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docker run -d -u daemon --ulimit nproc=3 busybox top
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docker run -d -u daemon --ulimit nproc=3 busybox top
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docker run -d -u daemon --ulimit nproc=3 busybox top
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@ -535,8 +527,39 @@ The 4th container fails and reports "[8] System error: resource temporarily unav
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This fails because the caller set `nproc=3` resulting in the first three containers using up
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the three processes quota set for the `daemon` user.
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### Stopping a container with a specific signal
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### Stop container with signal (--stop-signal)
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The `--stop-signal` flag sets the system call signal that will be sent to the container to exit.
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This signal can be a valid unsigned number that matches a position in the kernel's syscall table, for instance 9,
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or a signal name in the format SIGNAME, for instance SIGKILL.
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### A complete example
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$ docker run -d --name static static-web-files sh
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$ docker run -d --expose=8098 --name riak riakserver
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$ docker run -d -m 100m -e DEVELOPMENT=1 -e BRANCH=example-code -v $(pwd):/app/bin:ro --name app appserver
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$ docker run -d -p 1443:443 --dns=10.0.0.1 --dns-search=dev.org -v /var/log/httpd --volumes-from static --link riak --link app -h www.sven.dev.org --name web webserver
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$ docker run -t -i --rm --volumes-from web -w /var/log/httpd busybox tail -f access.log
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This example shows five containers that might be set up to test a web
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application change:
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1. Start a pre-prepared volume image `static-web-files` (in the background)
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that has CSS, image and static HTML in it, (with a `VOLUME` instruction in
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the Dockerfile to allow the web server to use those files);
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2. Start a pre-prepared `riakserver` image, give the container name `riak` and
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expose port `8098` to any containers that link to it;
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3. Start the `appserver` image, restricting its memory usage to 100MB, setting
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two environment variables `DEVELOPMENT` and `BRANCH` and bind-mounting the
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current directory (`$(pwd)`) in the container in read-only mode as `/app/bin`;
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4. Start the `webserver`, mapping port `443` in the container to port `1443` on
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the Docker server, setting the DNS server to `10.0.0.1` and DNS search
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domain to `dev.org`, creating a volume to put the log files into (so we can
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access it from another container), then importing the files from the volume
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exposed by the `static` container, and linking to all exposed ports from
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`riak` and `app`. Lastly, we set the hostname to `web.sven.dev.org` so its
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consistent with the pre-generated SSL certificate;
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5. Finally, we create a container that runs `tail -f access.log` using the logs
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volume from the `web` container, setting the workdir to `/var/log/httpd`. The
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`--rm` option means that when the container exits, the container's layer is
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removed.
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