本部分内容基于CentOS 7 进行整理, 仅为记录;
运维视角的使用 安装docker 出现Complemte! 表示则说明已安装成功;
查看Docker 版本 发现docker daemon 并没有启动而docker client已启动, 那么需要启动docker daemon
1 2 3 4 5 Client: Version: 1.13.1 API version: 1.26 Package version: Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?
启动docker daemon 并置为系统启动 1 2 systemctl start docker.service systemctl enable docker.service
再次查看Docker 版本 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 [root@VM-0-13-centos ~]# docker version Client: Version: 1.13.1 API version: 1.26 Package version: docker-1.13.1-209.git7d71120.el7.centos.x86_64 Go version: go1.10.3 Git commit: 7d71120/1.13.1 Built: Wed Mar 2 15:25:43 2022 OS/Arch: linux/amd64 Server: Version: 1.13.1 API version: 1.26 (minimum version 1.12) Package version: docker-1.13.1-209.git7d71120.el7.centos.x86_64 Go version: go1.10.3 Git commit: 7d71120/1.13.1 Built: Wed Mar 2 15:25:43 2022 OS/Arch: linux/amd64 Experimental: false
发现docker daemon , docker client 均已启动;
拉取CentOS 镜像 1 2 3 docker pull centos 或者 docker image pull centos
查看镜像 1 2 3 4 5 6 7 8 9 [root@VM-0-13-centos ~]# docker images REPOSITORY TAG IMAGE ID CREATED SIZE docker.io/ubuntu latest 27941809078c 4 weeks ago 77.8 MB docker.io/centos latest 5d0da3dc9764 9 months ago 231 MB [root@VM-0-13-centos ~]# docker image ls REPOSITORY TAG IMAGE ID CREATED SIZE docker.io/ubuntu latest 27941809078c 4 weeks ago 77.8 MB docker.io/centos latest 5d0da3dc9764 9 months ago 231 MB
两个命令均可以查看docker 镜像, 发现目前已经有两个镜像了, 均是刚拉取的镜像, 这里仅以centos作为示例;
启动镜像获得容器 1 2 3 4 [root@VM-0-13-centos ~]# docker run -it centos:latest /bin/bash [root@a99489e5262c /]# ---------------- 使用 docker container run -it centos:latest /bin/bash 是一样的;
发现已经进入了容器的控制台;
查看下容器内进程 1 2 3 4 [root@a99489e5262c /]# ps -elf F S UID PID PPID C PRI NI ADDR SZ WCHAN STIME TTY TIME CMD 4 S root 1 0 0 80 0 - 3009 do_wai 09:58 ? 00:00:00 /bin/bash 4 R root 14 1 0 80 0 - 11163 - 10:02 ? 00:00:00 ps -elf
发现目前有两个进程在运行, 一个是启动容器/bin/bash的进程, 一个是用来查看进程的进程 ps -elf
回退到Host 主机 Ctrl+PQ, 这样返回并不会关闭进程;
1 [root@a99489e5262c /]# [root@VM-0-13-centos ~]#
查看容器列表 1 2 3 [root@VM-0-13-centos ~]# docker container ls CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES a99489e5262c centos:latest "/bin/bash" 7 minutes ago Up 7 minutes gracious_colden
发现刚才启动的容器,确实在列表中;
查看Host的进程 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 l [root@VM-0-13-centos ~]# ps -elf F S UID PID PPID C PRI NI ADDR SZ WCHAN STIME TTY TIME CMD 4 S root 1 0 0 80 0 - 31438 ep_pol 17:16 ? 00:00:02 /usr/lib/systemd/systemd --switched-root --system --deserialize 22 1 S root 2 0 0 80 0 - 0 kthrea 17:16 ? 00:00:00 [kthreadd] 1 S root 4 2 0 60 -20 - 0 worker 17:16 ? 00:00:00 [kworker/0:0H] 1 S root 6 2 0 80 0 - 0 smpboo 17:16 ? 00:00:00 [ksoftirqd/0] 1 S root 7 2 0 -40 - - 0 smpboo 17:16 ? 00:00:00 [migration/0] 1 S root 8 2 0 80 0 - 0 rcu_gp 17:16 ? 00:00:00 [rcu_bh] 1 S root 9 2 0 80 0 - 0 rcu_gp 17:16 ? 00:00:00 [rcu_sched] 1 S root 10 2 0 60 -20 - 0 rescue 17:16 ? 00:00:00 [lru-add-drain] 5 S root 11 2 0 -40 - - 0 smpboo 17:16 ? 00:00:00 [watchdog/0] 5 S root 12 2 0 -40 - - 0 smpboo 17:16 ? 00:00:00 [watchdog/1] 1 S root 13 2 0 -40 - - 0 smpboo 17:16 ? 00:00:00 [migration/1] 1 S root 14 2 0 80 0 - 0 smpboo 17:16 ? 00:00:00 [ksoftirqd/1] 1 S root 16 2 0 60 -20 - 0 worker 17:16 ? 00:00:00 [kworker/1:0H] 5 S root 18 2 0 80 0 - 0 devtmp 17:16 ? 00:00:00 [kdevtmpfs] 1 S root 19 2 0 60 -20 - 0 rescue 17:16 ? 00:00:00 [netns] 1 S root 20 2 0 80 0 - 0 watchd 17:16 ? 00:00:00 [khungtaskd] 1 S root 21 2 0 60 -20 - 0 rescue 17:16 ? 00:00:00 [writeback] 1 S root 22 2 0 60 -20 - 0 rescue 17:16 ? 00:00:00 [kintegrityd] 1 S root 23 2 0 60 -20 - 0 rescue 17:16 ? 00:00:00 [bioset] 1 S root 24 2 0 60 -20 - 0 rescue 17:16 ? 00:00:00 [bioset] 1 S root 25 2 0 60 -20 - 0 rescue 17:16 ? 00:00:00 [bioset] 1 S root 26 2 0 60 -20 - 0 rescue 17:16 ? 00:00:00 [kblockd] 1 S root 27 2 0 60 -20 - 0 rescue 17:16 ? 00:00:00 [md] 1 S root 28 2 0 60 -20 - 0 rescue 17:16 ? 00:00:00 [edac-poller] 1 S root 29 2 0 60 -20 - 0 rescue 17:16 ? 00:00:00 [watchdogd] 1 S root 36 2 0 80 0 - 0 kswapd 17:16 ? 00:00:00 [kswapd0] 1 S root 37 2 0 85 5 - 0 ksm_sc 17:16 ? 00:00:00 [ksmd] 1 S root 38 2 0 99 19 - 0 khugep 17:16 ? 00:00:00 [khugepaged] 1 S root 39 2 0 60 -20 - 0 rescue 17:16 ? 00:00:00 [crypto] 1 S root 47 2 0 60 -20 - 0 rescue 17:16 ? 00:00:00 [kthrotld] 1 S root 48 2 0 80 0 - 0 worker 17:16 ? 00:00:00 [kworker/u4:1] 1 S root 49 2 0 60 -20 - 0 rescue 17:16 ? 00:00:00 [kmpath_rdacd] 1 S root 50 2 0 60 -20 - 0 rescue 17:16 ? 00:00:00 [kaluad] 1 S root 51 2 0 60 -20 - 0 rescue 17:16 ? 00:00:00 [kpsmoused] 1 S root 52 2 0 60 -20 - 0 rescue 17:16 ? 00:00:00 [ipv6_addrconf] 1 S root 65 2 0 60 -20 - 0 rescue 17:16 ? 00:00:00 [deferwq] 1 S root 108 2 0 80 0 - 0 kaudit 17:16 ? 00:00:00 [kauditd] 1 S root 238 2 0 60 -20 - 0 rescue 17:16 ? 00:00:00 [ata_sff] 1 S root 241 2 0 80 0 - 0 scsi_e 17:16 ? 00:00:00 [scsi_eh_0] 1 S root 242 2 0 60 -20 - 0 rescue 17:16 ? 00:00:00 [scsi_tmf_0] 1 S root 243 2 0 80 0 - 0 scsi_e 17:16 ? 00:00:00 [scsi_eh_1] 1 S root 244 2 0 60 -20 - 0 rescue 17:16 ? 00:00:00 [scsi_tmf_1] 1 S root 248 2 0 60 -20 - 0 worker 17:16 ? 00:00:00 [kworker/0:1H] 1 S root 252 2 0 60 -20 - 0 rescue 17:16 ? 00:00:00 [ttm_swap] 1 S root 272 2 0 60 -20 - 0 worker 17:16 ? 00:00:00 [kworker/1:1H] 1 S root 273 2 0 80 0 - 0 kjourn 17:16 ? 00:00:00 [jbd2/vda1-8] 1 S root 274 2 0 60 -20 - 0 rescue 17:16 ? 00:00:00 [ext4-rsv-conver] 4 S root 363 1 0 80 0 - 26239 ep_pol 17:16 ? 00:00:00 /usr/lib/systemd/systemd-journald 4 S root 385 1 0 80 0 - 31210 poll_s 17:16 ? 00:00:00 /usr/sbin/lvmetad -f 4 S root 396 1 0 80 0 - 11424 ep_pol 17:16 ? 00:00:00 /usr/lib/systemd/systemd-udevd 1 S root 513 2 0 60 -20 - 0 rescue 17:16 ? 00:00:00 [nfit] 1 S root 633 2 0 60 -20 - 0 rescue 17:16 ? 00:00:00 [rpciod] 1 S root 634 2 0 60 -20 - 0 rescue 17:16 ? 00:00:00 [xprtiod] 5 S root 636 1 0 76 -4 - 13883 ep_pol 17:16 ? 00:00:00 /sbin/auditd 4 S root 638 636 0 72 -8 - 21139 futex_ 17:16 ? 00:00:00 /sbin/audispd 4 S root 640 638 0 76 -4 - 13911 unix_s 17:16 ? 00:00:00 /usr/sbin/sedispatch 4 S polkitd 658 1 0 80 0 - 153610 poll_s 17:16 ? 00:00:00 /usr/lib/polkit-1/polkitd --no-debug 4 S root 659 1 0 80 0 - 6654 ep_pol 17:16 ? 00:00:00 /usr/lib/systemd/systemd-logind 5 S rpc 668 1 0 80 0 - 17320 poll_s 17:16 ? 00:00:00 /sbin/rpcbind -w 4 S dbus 672 1 0 80 0 - 15151 ep_pol 17:16 ? 00:00:00 /usr/bin/dbus-daemon --system --address=systemd: --nofork --nopidfile --syst 1 S root 674 1 0 80 0 - 1097 poll_s 17:16 ? 00:00:00 /usr/sbin/acpid 5 S ntp 679 1 0 80 0 - 12345 poll_s 17:16 ? 00:00:00 /usr/sbin/ntpd -u ntp:ntp -g 4 S libstor+ 685 1 0 80 0 - 2145 poll_s 17:16 ? 00:00:00 /usr/bin/lsmd -d 4 S avahi 686 1 0 80 0 - 15573 poll_s 17:16 ? 00:00:00 avahi-daemon: running [VM-0-13-centos.local] 1 S avahi 690 686 0 80 0 - 15541 unix_s 17:16 ? 00:00:00 avahi-daemon: chroot helper 1 S root 696 1 0 80 0 - 28853 do_wai 17:16 ? 00:00:00 /bin/bash /usr/sbin/ksmtuned 1 S root 697 1 0 80 0 - 50358 ep_pol 17:16 ? 00:00:00 /usr/sbin/gssproxy -D 1 S root 982 1 0 80 0 - 25726 poll_s 17:16 ? 00:00:00 /sbin/dhclient -H VM-0-13-centos -q -lf /var/lib/dhclient/dhclient--eth0.lea 4 S root 1055 1 0 80 0 - 146513 poll_s 17:16 ? 00:00:00 /usr/bin/python2 -Es /usr/sbin/tuned -l -P 4 S root 1076 1 0 80 0 - 185430 poll_s 17:16 ? 00:00:00 /usr/sbin/rsyslogd -n 4 S root 1090 1 0 80 0 - 251084 poll_s 17:16 ? 00:00:00 /usr/sbin/libvirtd 4 S root 1099 1 0 80 0 - 6477 hrtime 17:16 ? 00:00:00 /usr/sbin/atd -f 4 S root 1111 1 0 80 0 - 31598 hrtime 17:16 ? 00:00:00 /usr/sbin/crond -n 4 S root 1278 1 0 80 0 - 27552 n_tty_ 17:16 ttyS0 00:00:00 /sbin/agetty --keep-baud 115200,38400,9600 ttyS0 vt220 4 S root 1279 1 0 80 0 - 27552 n_tty_ 17:16 tty1 00:00:00 /sbin/agetty --noclear tty1 linux 1 S root 1314 1 0 80 0 - 7268 ep_pol 17:16 ? 00:00:00 /usr/local/qcloud/tat_agent/tat_agent 4 S root 1580 1 0 80 0 - 28231 poll_s 17:16 ? 00:00:00 /usr/sbin/sshd -D 5 S nobody 1592 1 0 80 0 - 13475 poll_s 17:16 ? 00:00:00 /usr/sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/default.conf --leasef 1 S root 1593 1592 0 80 0 - 13468 pipe_w 17:16 ? 00:00:00 /usr/sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/default.conf --leasef 4 S root 1598 1580 0 80 0 - 39852 poll_s 17:16 ? 00:00:00 sshd: root@pts/0 0 S root 1608 1 0 80 0 - 247139 do_wai 17:16 ? 00:00:00 /usr/local/qcloud/YunJing/YDLive/YDLive 1 S root 1628 1 0 80 0 - 24351 hrtime 17:17 ? 00:00:00 /usr/local/qcloud/stargate/bin/sgagent -d 1 S root 1644 1 0 80 0 - 38850 poll_s 17:17 ? 00:00:00 barad_agent 1 S root 1650 1644 0 80 0 - 41227 poll_s 17:17 ? 00:00:01 barad_agent 1 S root 1651 1644 0 80 0 - 134822 poll_s 17:17 ? 00:00:08 barad_agent 4 S root 1661 1608 0 80 0 - 251552 ep_pol 17:17 ? 00:00:12 /usr/local/qcloud/YunJing/YDEyes/YDService 0 S root 1801 1661 0 80 0 - 254192 futex_ 17:18 ? 00:00:00 /bin/sh -c sleep 100 4 S root 1846 1580 0 80 0 - 39775 poll_s 17:18 ? 00:00:00 sshd: root@notty 4 S root 1853 1846 0 80 0 - 18063 poll_s 17:18 ? 00:00:00 /usr/libexec/openssh/sftp-server 4 S root 1867 1598 0 80 0 - 29333 n_tty_ 17:18 pts/0 00:00:00 -bash 4 S root 1939 1 0 80 0 - 102654 poll_s 17:18 ? 00:00:00 /usr/libexec/packagekitd 4 S root 2242 1580 0 80 0 - 38684 poll_s 17:20 ? 00:00:00 sshd: root@notty 4 S root 2244 2242 0 80 0 - 28322 do_wai 17:20 ? 00:00:00 bash 0 S root 2300 2244 0 80 0 - 28321 do_wai 17:20 ? 00:00:00 sh /root/.vscode-server/bin/4af164ea3a06f701fe3e89a2bcbb421d2026b68f/bin/cod 0 S root 2312 2300 0 80 0 - 231839 ep_pol 17:20 ? 00:00:00 /root/.vscode-server/bin/4af164ea3a06f701fe3e89a2bcbb421d2026b68f/node /root 0 S root 2367 2312 0 80 0 - 157627 ep_pol 17:20 ? 00:00:00 /root/.vscode-server/bin/4af164ea3a06f701fe3e89a2bcbb421d2026b68f/node /root 4 S root 2885 1 0 80 0 - 204900 do_wai 17:22 ? 00:00:09 /usr/bin/dockerd-current --add-runtime docker-runc=/usr/libexec/docker/docke 4 S root 2893 2885 0 80 0 - 80069 futex_ 17:22 ? 00:00:01 /usr/bin/docker-containerd-current -l unix:///var/run/docker/libcontainerd/d 1 S root 5538 2 0 80 0 - 0 worker 17:37 ? 00:00:00 [kworker/1:0] 1 S root 5564 2 0 80 0 - 0 worker 17:37 ? 00:00:00 [kworker/u4:0] 4 S root 6971 1580 0 80 0 - 39850 poll_s 17:47 ? 00:00:00 sshd: root@pts/1 4 S root 6973 1580 0 80 0 - 39775 poll_s 17:47 ? 00:00:00 sshd: root@notty 4 S root 6975 6971 0 80 0 - 29151 n_tty_ 17:47 pts/1 00:00:00 -bash 4 S root 7015 6973 0 80 0 - 18063 poll_s 17:47 ? 00:00:00 /usr/libexec/openssh/sftp-server 1 S root 7421 2 0 80 0 - 0 worker 17:50 ? 00:00:00 [kworker/0:2] 4 R root 7859 1580 0 80 0 - 39850 - 17:53 ? 00:00:00 sshd: root@pts/2 4 S root 7861 1580 0 80 0 - 39775 poll_s 17:53 ? 00:00:00 sshd: root@notty 4 S root 7863 7859 0 80 0 - 29151 do_wai 17:53 pts/2 00:00:00 -bash 4 S root 7905 7861 0 80 0 - 18063 poll_s 17:53 ? 00:00:00 /usr/libexec/openssh/sftp-server 1 S root 8224 2 0 80 0 - 0 worker 17:55 ? 00:00:00 [kworker/0:0] 0 S root 8674 2893 0 80 0 - 68577 futex_ 17:58 ? 00:00:00 /usr/bin/docker-containerd-shim-current a99489e5262c774cc07629fdd3fffc2a9732 4 S root 8691 8674 0 80 0 - 3009 poll_s 17:58 pts/3 00:00:00 /bin/bash 1 S root 9005 2 0 80 0 - 0 worker 18:00 ? 00:00:00 [kworker/1:2] 1 S root 9742 2 0 80 0 - 0 worker 18:05 ? 00:00:00 [kworker/0:1] 0 S root 9785 2244 0 80 0 - 27014 hrtime 18:05 ? 00:00:00 sleep 180 0 S root 9951 696 0 80 0 - 27014 hrtime 18:06 ? 00:00:00 sleep 60 0 R root 10085 7863 0 80 0 - 38869 - 18:07 pts/2 00:00:00 ps -elf
发现Host 的进程比容器内多得多;
连接到运行中的容器中 1 2 [root@VM-0-13-centos ~]# docker container exec -it gracious_colden bash [root@a99489e5262c /]#
回退到Host 这里依旧没有直接退出, 用的Ctrl+PQ
再次查看容器状态 1 2 3 4 [root@a99489e5262c /]# [root@VM-0-13-centos ~]# docker container ls CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES a99489e5262c centos:latest "/bin/bash" 14 minutes ago Up 14 minutes gracious_colden
关闭容器 1 2 3 4 5 6 [root@VM-0-13-centos ~]# docker container stop gracious_colden gracious_colden [root@VM-0-13-centos ~]# docker container ls CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES [root@VM-0-13-centos ~]#
通过docker container stop 或 docker container rm, 命令是一样效果; 再次查看容器状态,发现已经没有了;
开发视角的使用 本部分内容,会根据应用代码中的Docerfile将应用容器化,并使用容器的方式运行;代码来源于Docker Deep Dive 的配套资源;
