centos 环境下安装docker
官网：https://www.docker.com
[sudo] yum update
[sudo] yum install docker
docker run -d -i -t <imageID> /bin/bash 启动centos7
docker attach <ContainerID> 进入容器
docker 启动/停止
dockerSer.sh echo 'start or stop' read cmd service docker $cmd
查看docker信息
[root@localhost my.Shells]# docker info Containers: 0 Running: 0 Paused: 0 Stopped: 0 Images: 0 Server Version: 1.12.6 Storage Driver: devicemapper Pool Name: docker-253:0-34475014-pool Pool Blocksize: 65.54 kB Base Device Size: 10.74 GB Backing Filesystem: xfs Data file: /dev/loop0 Metadata file: /dev/loop1 Data Space Used: 11.8 MB Data Space Total: 107.4 GB Data Space Available: 12.35 GB Metadata Space Used: 581.6 kB Metadata Space Total: 2.147 GB Metadata Space Available: 2.147 GB Thin Pool Minimum Free Space: 10.74 GB Udev Sync Supported: true Deferred Removal Enabled: true Deferred Deletion Enabled: true Deferred Deleted Device Count: 0 Data loop file: /var/lib/docker/devicemapper/devicemapper/data WARNING: Usage of loopback devices is strongly discouraged for production use. Use `--storage-opt dm.thinpooldev` to specify a custom block storage device. Metadata loop file: /var/lib/docker/devicemapper/devicemapper/metadata Library Version: 1.02.140-RHEL7 (2017-05-03) Logging Driver: journald Cgroup Driver: systemd Plugins: Volume: local Network: overlay null bridge host Swarm: inactive Runtimes: docker-runc runc Default Runtime: docker-runc Security Options: seccomp selinux Kernel Version: 3.10.0-693.11.6.el7.x86_64 Operating System: CentOS Linux 7 (Core) OSType: linux Architecture: x86_64 Number of Docker Hooks: 3 CPUs: 4 Total Memory: 984 MiB Name: localhost ID: DGMG:ZB6K:6WXP:XL3L:4EW6:FOES:5U3S:3WFP:HTH3:G6YU:QGER:36ND Docker Root Dir: /var/lib/docker Debug Mode (client): false Debug Mode (server): false Registry: https://index.docker.io/v1/ Insecure Registries: 127.0.0.0/8 Registries: docker.io (secure)
镜像下载和查看
[root@localhost my.Shells]# docker images //查看已下载镜像 REPOSITORY TAG IMAGE ID CREATED SIZE docker.io/ubuntu latest 2a4cca5ac898 6 days ago 111.5 MB [root@localhost my.Shells]# docker pull redis //下载redis镜像 Using default tag: latest Trying to pull repository docker.io/library/redis ... latest: Pulling from docker.io/library/redis c4bb02b17bb4: Pull complete 58638acf67c5: Pull complete f98d108cc38b: Pull complete 83be14fccb07: Pull complete 5d5f41793421: Pull complete ed89ff0d9eb2: Pull complete Digest: sha256:0e773022cd6572a5153e5013afced0f7191652d3cdf9b1c6785eb13f6b2974b1 [root@localhost my.Shells]# docker images REPOSITORY TAG IMAGE ID CREATED SIZE docker.io/ubuntu latest 2a4cca5ac898 6 days ago 111.5 MB docker.io/redis latest 1e70071f4af4 5 weeks ago 106.7 MB
运行镜像-->容器
[root@localhost my.Shells]# docker images REPOSITORY TAG IMAGE ID CREATED SIZE docker.io/ubuntu latest 2a4cca5ac898 6 days ago 111.5 MB docker.io/redis latest 1e70071f4af4 5 weeks ago 106.7 MB [root@localhost my.Shells]# docker run docker.io/redis //此时redis已经启动了 1:C 22 Jan 08:46:17.090 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo 1:C 22 Jan 08:46:17.091 # Redis version=4.0.6, bits=64, commit=00000000, modified=0, pid=1, just started 1:C 22 Jan 08:46:17.091 # Warning: no config file specified, using the default config. In order to specify a config file use redis-server /path/to/redis.conf 1:M 22 Jan 08:46:17.095 * Running mode=standalone, port=6379. 1:M 22 Jan 08:46:17.096 # WARNING: The TCP backlog setting of 511 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 128. 1:M 22 Jan 08:46:17.096 # Server initialized 1:M 22 Jan 08:46:17.096 # WARNING overcommit_memory is set to 0! Background save may fail under low memory condition. To fix this issue add 'vm.overcommit_memory = 1' to /etc/sysctl.conf and then reboot or run the command 'sysctl vm.overcommit_memory=1' for this to take effect. 1:M 22 Jan 08:46:17.099 # WARNING you have Transparent Huge Pages (THP) support enabled in your kernel. This will create latency and memory usage issues with Redis. To fix this issue run the command 'echo never > /sys/kernel/mm/transparent_hugepage/enabled' as root, and add it to your /etc/rc.local in order to retain the setting after a reboot. Redis must be restarted after THP is disabled. 1:M 22 Jan 08:46:17.099 * Ready to accept connections
查看运行的容器进程
[root@localhost my.Shells]# docker ps //查看运行中的 CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 462a2c9aba6a docker.io/redis "docker-entrypoint.sh" 2 minutes ago Up 2 minutes 6379/tcp romantic_booth [root@localhost my.Shells]# docker ps -a //查看运行和停止的，即所有的 CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 462a2c9aba6a docker.io/redis "docker-entrypoint.sh" 2 minutes ago Up 2 minutes 6379/tcp romantic_booth 501897fca8d5 ubuntu "echo hello" 42 minutes ago Exited (0) 42 minutes ago fervent_fermat
停止容器
[root@localhost my.Shells]# docker stop 462a2c9aba6a //这个id是CONTAINER ID,即容器id，注意不是镜像id（IMAGE ID） 462a2c9aba6a [root@localhost my.Shells]# docker ps //运行的没有了 CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES [root@localhost my.Shells]# docker ps -a //有两个停止的容器 CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 462a2c9aba6a docker.io/redis "docker-entrypoint.sh" 5 minutes ago Exited (0) 12 seconds ago romantic_booth 501897fca8d5 ubuntu "echo hello" 45 minutes ago Exited (0) 45 minutes ago fervent_fermat
登录容器
[root@localhost my.Shells]# docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 462a2c9aba6a docker.io/redis "docker-entrypoint.sh" 4 hours ago Up 11 seconds 6379/tcp romantic_booth [root@localhost my.Shells]# docker exec -it 462a2c9aba6a bash //登陆容器 root@462a2c9aba6a:/data# ls dump.rdb root@462a2c9aba6a:/data# redis-cli -p 6379 //登陆redis(必须先登录容器，容器其实就是一个linux系统) 127.0.0.1:6379> keys * //正常操作redis (empty list or set) 127.0.0.1:6379> quit //退出redis root@462a2c9aba6a:/opt# exit //退出容器 exit
删除容器
[root@localhost my.Shells]# docker ps -a CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 462a2c9aba6a docker.io/redis "docker-entrypoint.sh" 5 minutes ago Exited (0) 12 seconds ago romantic_booth 501897fca8d5 ubuntu "echo hello" 45 minutes ago Exited (0) 45 minutes ago fervent_fermat [root@localhost my.Shells]# docker rm 501897fca8d5 //注意是容器ID,不是镜像ID。删除ubuntu容器，等于卸载它，但镜像还在，可以下次再运行镜像为容器 501897fca8d5 [root@localhost my.Shells]# docker ps -a //还剩一个 CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 462a2c9aba6a docker.io/redis "docker-entrypoint.sh" 11 minutes ago Exited (0) 6 minutes ago romantic_booth
删除下载的镜像
docker rmi 2a4cca5ac898 //注意：这里是镜像ID
保存容器为镜像
把配置好的容器保存为一个新的镜像文件 docker commit -m ‘xxx’ 容器ID 新名字 docker commit -m ‘fun’ e23acsasd4323 nginx-fun
Dockerfile 尽可能少RUN，合并RUN操作 centos7+jdk8+gradle+maven+docker-ce+git 镜像 ，在run.sh中git clone 代码，然后gradle build，然后java -jar启动，
这样镜像不用更新，每次启动容器都会拉代码打包运行。 gitlab-ci中，可以配置远程登录到启动的容器中，然后git pull 代码，然后gradle build，然后java -jar启动，这样原先环境的数据还在，只是重启了一下服务。
如何远程登录到docker容器 https://www.jianshu.com/p/c4d4ee6f3663
source /etc/profile echo "evn: centos7" java -version # jdk8 git --version # git version 1.8.3.1 mvn -v # Apache Maven 3.1.1 gradle -v # gradle 4.10.3 echo hosts >> /etc/hosts echo /etc/hosts #git clone xxx #java -jar xxx.jar