docker 的容器入門
阿新 • • 發佈：2018-12-01
Linux Namespace
LXC所實現的隔離性主要是來自kernel的namespace, 其中pid, net, ipc, mnt, uts 等namespace將container的程序, 網路, 訊息, 檔案系統和hostname 隔離開。Control Groups
cgroups 實現了對資源的配額和度量。 cgroups 的使用非常簡單，提供類似檔案的介面，在 /cgroup目錄下新建一個資料夾即可新建一個group，在此資料夾中新建task檔案，並將pid寫入該檔案，即可實現對該程序的資源控制。具體的資源配置選項可以在該資料夾中新建子 subsystem ，{子系統字首}.{資源項} 是典型的配置方法。 安裝docker[[email protected] ~]# yum -y install epel-release [[email protected] ~]# yum -y install docker [[email protected] ~]# systemctl start docker [[email protected] ~]# docker images 檢視存在的映象 REPOSITORY TAG IMAGE ID CREATED SIZE [[email protected] ~]# docker pull tomcat 下載映象 Using default tag: latest Trying to pull repository docker.io/library/tomcat ... latest: Pulling from docker.io/library/tomcat 54f7e8ac135a: Pull complete d6341e30912f: Pull complete 087a57faf949: Pull complete 95065f220961: Pull complete 0887630ce576: Pull complete c375d1959fab: Pull complete e00a5e6055cc: Pull complete 8319f5fb56cf: Pull complete 258c74eb25ab: Pull complete 6eb86d11d371: Pull complete adb5a4a6adf5: Pull complete 4685b434f297: Pull complete Digest: sha256:e394c2f94eee344300e68d7183f3f19d272316f9691b280ac0e3911ea610e590 Status: Downloaded newer image for docker.io/tomcat:latest [[email protected] ~]# docker images REPOSITORY TAG IMAGE ID CREATED SIZE docker.io/tomcat latest 78b258e36eed 13 days ago 463 MB
[[email protected] ~]# docker run -it -d -p 8888:8080 tomcat:latest 後臺啟動容器將容器的8080與本機的8888埠進行繫結 d588baa6a123a47913a112a5c3ee3f52f0a9f2c2c412ec1a46a527f32222ab6a
前端訪問http://192.168.10.31:8888/
檢視執行容器
[[email protected] ~]# ss -lntp State Recv-Q Send-Q Local Address:Port Peer Address:Port LISTEN 0 128 *:22 *:* users:(("sshd",pid=1000,fd=3))LISTEN 0 100 127.0.0.1:25 *:* users:(("master",pid=1159,fd=13))LISTEN 0 128 :::22 :::* users:(("sshd",pid=1000,fd=4))LISTEN 0 128 :::8888 :::* users:(("docker-proxy-cu",pid=2762,fd=4))LISTEN 0 100 ::1:25 :::* users:(("master",pid=1159,fd=14))
[[email protected] ~]# docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 967a88f8ea47 tomcat:latest "catalina.sh run" 3 minutes ago Up 3 minutes 0.0.0.0:8888->8080/tcp wonderful_swanson
停止容器停止
[[email protected] ~]# docker stop 967a88f8ea47 停止容器 967a88f8ea47 [[email protected] ~]# docker ps 檢視執行的容器 CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES [[email protected] ~]# docker ps -a 檢視所有容器 CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 967a88f8ea47 tomcat:latest "catalina.sh run" 7 minutes ago Exited (143) 7 seconds ago wonderful_swanson