CentOS6.6安装和使用Docker
Docker简介docker 是一个linux 上的LXC 容器项目，是很轻量级的虚拟化技术。
docker虽然基于lxc技术（cgroup、namespace等），但是思路完全和lxc不一样。
lxc看起来更像是一个虚拟机，多用于操作系统级别的虚拟化，背后的哲学是 IAAS；
而docker看起来是一个程序，跑在沙箱里的程序，属于应用程序级别的虚拟化，背后的哲学是 PAAS。
RHEL 6.5 开始提供docker 支持，我们使用 CentOS 6.6 x64 进行实验。
安装
yum install docker-io
如果提示：no package docker-io available
请先安装如下的rpm包，添加仓库地址：
rpm -iUvh http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
命令
查看版本：docker -v
查看帮助信息：docker
在官方仓库搜寻镜像：docker search centos
查看本地镜像：docker images
下载仓库镜像到本地：docker pull centos:latest
上传本地镜像到仓库：docker push NAME[:TAG]
将镜像保存为tar文件：docker save -o tar文件 镜像ID/镜像tag
将tar文件加载为镜像：docker load -i tar文件
修改镜像tag：docker tag 镜像ID 镜像tag
删除镜像：docker rmi 镜像ID/镜像tag
制作镜像：docker build -t centos:autosshd - < dockerfile.txt
dockerfile.txt:
FROM centos
MAINTAINER YH, http://yuanhuan.blog.51cto.com
RUN yum install passwd openssl openssh-server -y
RUN echo '123456' | passwd --stdin root
RUN ssh-keygen -q -t rsa -b 2048 -f /etc/ssh/ssh_host_rsa_key -N ''
RUN ssh-keygen -q -t ecdsa -f /etc/ssh/ssh_host_ecdsa_key -N ''
RUN sed -i '/^session\s\+required\s\+pam_loginuid.so/s/^/#/' /etc/pam.d/sshd
RUN mkdir -p /root/.ssh && chown root.root /root && chmod 700 /root/.ssh
EXPOSE 22
CMD ip addr ls eth0 | awk '{print $2}' | egrep -o '(+\.){3}+';/usr/sbin/sshd -D 查看镜像历史：docker history 镜像ID/镜像tag
创建容器：docker run -d --name=容器名称 镜像ID/镜像tag
将宿主机的80端口映射为容器的80端口：docker run -d -p 80:80 --name=容器名称 镜像ID/镜像tag
启动容器：docker start 容器名称/容器ID
查看容器：docker ps
重启容器：docker restart 容器名称/容器ID
停止容器：docker stop 容器名称/容器ID
删除容器：docker rm 容器名称/容器ID
暂停容器：docker pause 容器名称/容器ID
恢复容器：docker unpause 容器名称/容器ID
执行命令：docker exec -ti 容器名称/容器ID /bin/bash
获取容器日志：docker logs 容器名称/容器ID
典型应用场景
1. 应用打包：RPM打包，Tomcat应用服务器打包，Web服务器打包等；
2. 多版本混合部署：只用部署多个docker容器，每个版本一个容器，再通过hosting主机和容器做端口映射；
3. 升级回滚：升级时，只需停掉原有docker容器，新建一个新版本的容器即可，如有问题将旧版本容器重启即可；
4. 多租户资源隔离：docker容器充分利用linux内核的namespaces提供资源隔离功能，结合cgroup，可以方便的设置某个容器的资源配额。 既能满足资源隔离的需求，又能方便的为不同级别的用户设置不同级别的配额限制；
5. 内部开发环境：不必像以往一样为每个开发人员分配一个或多个虚拟机，只用分配docker容器即可，资源利用率将会大幅上升；
附完整的docker-1.4.1命令：
Usage: docker COMMAND
A self-sufficient runtime for linux containers.
Options:
--api-enable-cors=false Enable CORS headers in the remote API
-b, --bridge="" Attach containers to a pre-existing network bridge
use 'none' to disable container networking
--bip="" Use this CIDR notation address for the network bridge's IP, not compatible with -b
-D, --debug=false Enable debug mode
-d, --daemon=false Enable daemon mode
--dns=[] Force Docker to use specific DNS servers
--dns-search=[] Force Docker to use specific DNS search domains
-e, --exec-driver="native" Force the Docker runtime to use a specific exec driver
--fixed-cidr="" IPv4 subnet for fixed IPs (ex: 10.20.0.0/16)
this subnet must be nested in the bridge subnet (which is defined by -b or --bip)
-G, --group="docker" Group to assign the unix socket specified by -H when running in daemon mode
use '' (the empty string) to disable setting of a group
-g, --graph="/var/lib/docker" Path to use as the root of the Docker runtime
-H, --host=[] The socket(s) to bind to in daemon mode or connect to in client mode, specified using one or more tcp://host:port, unix:///path/to/socket, fd://* or fd://socketfd.
--icc=true Allow unrestricted inter-container and Docker daemon host communication
--insecure-registry=[] Enable insecure communication with specified registries (no certificate verification for HTTPS and enable HTTP fallback) (e.g., localhost:5000 or 10.20.0.0/16)
--ip=0.0.0.0 Default IP address to use when binding container ports
--ip-forward=true Enable net.ipv4.ip_forward
--ip-masq=true Enable IP masquerading for bridge's IP range
--iptables=true Enable Docker's addition of iptables rules
-l, --log-level="info" Set the logging level
--label=[] Set key=value labels to the daemon (displayed in `docker info`)
--mtu=0 Set the containers network MTU
if no value is provided: default to the default route MTU or 1500 if no default route is available
-p, --pidfile="/var/run/docker.pid" Path to use for daemon PID file
--registry-mirror=[] Specify a preferred Docker registry mirror
-s, --storage-driver="" Force the Docker runtime to use a specific storage driver
--selinux-enabled=false Enable selinux support. SELinux does not presently support the BTRFS storage driver
--storage-opt=[] Set storage driver options
--tls=false Use TLS; implied by --tlsverify flag
--tlscacert="/etc/docker/ca.pem" Trust only remotes providing a certificate signed by the CA given here
--tlscert="/etc/docker/cert.pem" Path to TLS certificate file
--tlskey="/etc/docker/key.pem" Path to TLS key file
--tlsverify=false Use TLS and verify the remote (daemon: verify client, client: verify daemon)
-v, --version=false Print version information and quit
Commands:
attach Attach to a running container
build Build an image from a Dockerfile
commit Create a new image from a container's changes
cp Copy files/folders from a container's filesystem to the host path
create Create a new container
diff Inspect changes on a container's filesystem
events Get real time events from the server
exec Run a command in a running container
export Stream the contents of a container as a tar archive
history Show the history of an image
images List images
import Create a new filesystem image from the contents of a tarball
info Display system-wide information
inspect Return low-level information on a container
kill Kill a running container
load Load an image from a tar archive
login Register or log in to a Docker registry server
logout Log out from a Docker registry server
logs Fetch the logs of a container
port Lookup the public-facing port that is NAT-ed to PRIVATE_PORT
pause Pause all processes within a container
ps List containers
pull Pull an image or a repository from a Docker registry server
push Push an image or a repository to a Docker registry server
restart Restart a running container
rm Remove one or more containers
rmi Remove one or more images
run Run a command in a new container
save Save an image to a tar archive
search Search for an image on the Docker Hub
start Start a stopped container
stop Stop a running container
tag Tag an image into a repository
top Lookup the running processes of a container
unpause Unpause a paused container
version Show the Docker version information
wait Block until a container stops, then print its exit code
Run 'docker COMMAND --help' for more information on a command.
Usage: docker attach CONTAINER
Attach to a running container
--no-stdin=false Do not attach STDIN
--sig-proxy=true Proxy all received signals to the process (non-TTY mode only). SIGCHLD, SIGKILL, and SIGSTOP are not proxied.
Usage: docker build PATH | URL | -
Build a new image from the source code at PATH
--force-rm=false Always remove intermediate containers, even after unsuccessful builds
--no-cache=false Do not use cache when building the image
--pull=false Always attempt to pull a newer version of the image
-q, --quiet=false Suppress the verbose output generated by the containers
--rm=true Remove intermediate containers after a successful build
-t, --tag="" Repository name (and optionally a tag) to be applied to the resulting image in case of success
Usage: docker commit CONTAINER ]
Create a new image from a container's changes
-a, --author="" Author (e.g., "John Hannibal Smith <hannibal@a-team.com>")
-m, --message="" Commit message
-p, --pause=true Pause container during commit
Usage: docker cp CONTAINER:PATH HOSTPATH
Copy files/folders from the PATH to the HOSTPATH
Usage: docker create IMAGE
Create a new container
-a, --attach=[] Attach to STDIN, STDOUT or STDERR.
--add-host=[] Add a custom host-to-IP mapping (host:ip)
-c, --cpu-shares=0 CPU shares (relative weight)
--cap-add=[] Add Linux capabilities
--cap-drop=[] Drop Linux capabilities
--cidfile="" Write the container ID to the file
--cpuset="" CPUs in which to allow execution (0-3, 0,1)
--device=[] Add a host device to the container (e.g. --device=/dev/sdc:/dev/xvdc:rwm)
--dns=[] Set custom DNS servers
--dns-search=[] Set custom DNS search domains (Use --dns-search=. if you don't wish to set the search domain)
-e, --env=[] Set environment variables
--entrypoint="" Overwrite the default ENTRYPOINT of the image
--env-file=[] Read in a line delimited file of environment variables
--expose=[] Expose a port or a range of ports (e.g. --expose=3300-3310) from the container without publishing it to your host
-h, --hostname="" Container host name
-i, --interactive=false Keep STDIN open even if not attached
--ipc="" Default is to create a private IPC namespace (POSIX SysV IPC) for the container
'container:<name|id>': reuses another container shared memory, semaphores and message queues
'host': use the host shared memory,semaphores and message queues inside the container.Note: the host mode gives the container full access to local shared memory and is therefore considered insecure.
--link=[] Add link to another container in the form of name:alias
--lxc-conf=[] (lxc exec-driver only) Add custom lxc options --lxc-conf="lxc.cgroup.cpuset.cpus = 0,1"
-m, --memory="" Memory limit (format: <number><optional unit>, where unit = b, k, m or g)
--mac-address="" Container MAC address (e.g. 92:d0:c6:0a:29:33)
--name="" Assign a name to the container
--net="bridge" Set the Network mode for the container
'bridge': creates a new network stack for the container on the docker bridge
'none': no networking for this container
'container:<name|id>': reuses another container network stack
'host': use the host network stack inside the container.Note: the host mode gives the container full access to local system services such as D-bus and is therefore considered insecure.
-P, --publish-all=false Publish all exposed ports to the host interfaces
-p, --publish=[] Publish a container's port to the host
format: ip:hostPort:containerPort | ip::containerPort | hostPort:containerPort | containerPort
(use 'docker port' to see the actual mapping)
--privileged=false Give extended privileges to this container
--restart="" Restart policy to apply when a container exits (no, on-failure[:max-retry], always)
--security-opt=[] Security Options
-t, --tty=false Allocate a pseudo-TTY
-u, --user="" Username or UID
-v, --volume=[] Bind mount a volume (e.g., from the host: -v /host:/container, from Docker: -v /container)
--volumes-from=[] Mount volumes from the specified container(s)
-w, --workdir="" Working directory inside the container
Usage: docker diff CONTAINER
Inspect changes on a container's filesystem
Usage: docker events
Get real time events from the server
-f, --filter=[] Provide filter values (i.e. 'event=stop')
--since="" Show all events created since timestamp
--until="" Stream events until this timestamp
Usage: docker exec CONTAINER COMMAND
Run a command in a running container
-d, --detach=false Detached mode: run command in the background
-i, --interactive=false Keep STDIN open even if not attached
-t, --tty=false Allocate a pseudo-TTY
Usage: docker export CONTAINER
Export the contents of a filesystem as a tar archive to STDOUT
Usage: docker history IMAGE
Show the history of an image
--no-trunc=false Don't truncate output
-q, --quiet=false Only show numeric IDs
Usage: docker images
List images
-a, --all=false Show all images (by default filter out the intermediate image layers)
-f, --filter=[] Provide filter values (i.e. 'dangling=true')
--no-trunc=false Don't truncate output
-q, --quiet=false Only show numeric IDs
Usage: docker import URL|- ]
Create an empty filesystem image and import the contents of the tarball (.tar, .tar.gz, .tgz, .bzip, .tar.xz, .txz) into it, then optionally tag it.
Usage: docker info
Display system-wide information
Usage: docker inspect CONTAINER|IMAGE
Return low-level information on a container or image
-f, --format="" Format the output using the given go template.
Usage: docker kill CONTAINER
Kill a running container using SIGKILL or a specified signal
-s, --signal="KILL" Signal to send to the container
Usage: docker load
Load an image from a tar archive on STDIN
-i, --input="" Read from a tar archive file, instead of STDIN
Usage: docker login
Register or log in to a Docker registry server, if no server is specified "https://index.docker.io/v1/" is the default.
-e, --email="" Email
-p, --password="" Password
-u, --username="" Username
Usage: docker logout
Log out from a Docker registry, if no server is specified "https://index.docker.io/v1/" is the default.
Usage: docker logs CONTAINER
Fetch the logs of a container
-f, --follow=false Follow log output
-t, --timestamps=false Show timestamps
--tail="all" Output the specified number of lines at the end of logs (defaults to all logs)
Usage: docker port CONTAINER ]
List port mappings for the CONTAINER, or lookup the public-facing port that is NAT-ed to the PRIVATE_PORT
Usage: docker pause CONTAINER
Pause all processes within a container
Usage: docker ps
List containers
-a, --all=false Show all containers. Only running containers are shown by default.
--before="" Show only container created before Id or Name, include non-running ones.
-f, --filter=[] Provide filter values. Valid filters:
exited=<int> - containers with exit code of <int>
status=(restarting|running|paused|exited)
-l, --latest=false Show only the latest created container, include non-running ones.
-n=-1 Show n last created containers, include non-running ones.
--no-trunc=false Don't truncate output
-q, --quiet=false Only display numeric IDs
-s, --size=false Display total file sizes
--since="" Show only containers created since Id or Name, include non-running ones.
Usage: docker pull NAME[:TAG]
Pull an image or a repository from the registry
-a, --all-tags=false Download all tagged images in the repository
Usage: docker push NAME[:TAG]
Push an image or a repository to the registry
Usage: docker restart CONTAINER
Restart a running container
-t, --time=10 Number of seconds to try to stop for before killing the container. Once killed it will then be restarted. Default is 10 seconds.
Usage: docker rm CONTAINER
Remove one or more containers
-f, --force=false Force the removal of a running container (uses SIGKILL)
-l, --link=false Remove the specified link and not the underlying container
-v, --volumes=false Remove the volumes associated with the container
Usage: docker rmi IMAGE
Remove one or more images
-f, --force=false Force removal of the image
--no-prune=false Do not delete untagged parents
Usage: docker run IMAGE
Run a command in a new container
-a, --attach=[] Attach to STDIN, STDOUT or STDERR.
--add-host=[] Add a custom host-to-IP mapping (host:ip)
-c, --cpu-shares=0 CPU shares (relative weight)
--cap-add=[] Add Linux capabilities
--cap-drop=[] Drop Linux capabilities
--cidfile="" Write the container ID to the file
--cpuset="" CPUs in which to allow execution (0-3, 0,1)
-d, --detach=false Detached mode: run the container in the background and print the new container ID
--device=[] Add a host device to the container (e.g. --device=/dev/sdc:/dev/xvdc:rwm)
--dns=[] Set custom DNS servers
--dns-search=[] Set custom DNS search domains (Use --dns-search=. if you don't wish to set the search domain)
-e, --env=[] Set environment variables
--entrypoint="" Overwrite the default ENTRYPOINT of the image
--env-file=[] Read in a line delimited file of environment variables
--expose=[] Expose a port or a range of ports (e.g. --expose=3300-3310) from the container without publishing it to your host
-h, --hostname="" Container host name
-i, --interactive=false Keep STDIN open even if not attached
--ipc="" Default is to create a private IPC namespace (POSIX SysV IPC) for the container
'container:<name|id>': reuses another container shared memory, semaphores and message queues
'host': use the host shared memory,semaphores and message queues inside the container.Note: the host mode gives the container full access to local shared memory and is therefore considered insecure.
--link=[] Add link to another container in the form of name:alias
--lxc-conf=[] (lxc exec-driver only) Add custom lxc options --lxc-conf="lxc.cgroup.cpuset.cpus = 0,1"
-m, --memory="" Memory limit (format: <number><optional unit>, where unit = b, k, m or g)
--mac-address="" Container MAC address (e.g. 92:d0:c6:0a:29:33)
--name="" Assign a name to the container
--net="bridge" Set the Network mode for the container
'bridge': creates a new network stack for the container on the docker bridge
'none': no networking for this container
'container:<name|id>': reuses another container network stack
'host': use the host network stack inside the container.Note: the host mode gives the container full access to local system services such as D-bus and is therefore considered insecure.
-P, --publish-all=false Publish all exposed ports to the host interfaces
-p, --publish=[] Publish a container's port to the host
format: ip:hostPort:containerPort | ip::containerPort | hostPort:containerPort | containerPort
(use 'docker port' to see the actual mapping)
--privileged=false Give extended privileges to this container
--restart="" Restart policy to apply when a container exits (no, on-failure[:max-retry], always)
--rm=false Automatically remove the container when it exits (incompatible with -d)
--security-opt=[] Security Options
--sig-proxy=true Proxy received signals to the process (non-TTY mode only). SIGCHLD, SIGSTOP, and SIGKILL are not proxied.
-t, --tty=false Allocate a pseudo-TTY
-u, --user="" Username or UID
-v, --volume=[] Bind mount a volume (e.g., from the host: -v /host:/container, from Docker: -v /container)
--volumes-from=[] Mount volumes from the specified container(s)
-w, --workdir="" Working directory inside the container
Usage: docker save IMAGE
Save an image(s) to a tar archive (streamed to STDOUT by default)
-o, --output="" Write to a file, instead of STDOUT
Usage: docker search TERM
Search the Docker Hub for images
--automated=false Only show automated builds
--no-trunc=false Don't truncate output
-s, --stars=0 Only displays with at least x stars
Usage: docker start CONTAINER
Restart a stopped container
-a, --attach=false Attach container's STDOUT and STDERR and forward all signals to the process
-i, --interactive=false Attach container's STDIN
Usage: docker stop CONTAINER
Stop a running container by sending SIGTERM and then SIGKILL after a grace period
-t, --time=10 Number of seconds to wait for the container to stop before killing it. Default is 10 seconds.
Usage: docker tag IMAGE[:TAG] NAME[:TAG]
Tag an image into a repository
-f, --force=false Force
Usage: docker top CONTAINER
Display the running processes of a container
Usage: docker unpause CONTAINER
Unpause all processes within a container
Usage: docker version
Show the Docker version information.
Usage: docker wait CONTAINER
Block until a container stops, then print its exit code.
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