簡述docker一些常用的操作
- 查看到docker是否正常運行
docker info
wangande@ubuntu:~$ sudo docker info
Containers: 82
Images: 37
Server Version: 1.9.1
Storage Driver: aufs
Root Dir: /var/lib/docker/aufs
Backing Filesystem: extfs
Dirs: 201
Dirperm1 Supported: false
Execution Driver: native-0.2
Logging Driver: json-file
Kernel Version: 3.13.0-32-generic
Operating System: Ubuntu 14.04.1 LTS
CPUs: 1
Total Memory: 986.8 MiB
Name: ubuntu
ID: SZML:DAOQ:6BT5:4QJP:KQSX:NBXL:KBQG:HUF5:CVKQ:LIVI:V55U:24BH
返回所有docker所有容器和鏡像的數量，docker使用的執行驅動和存儲驅動，以及docker的基本配置docker 是一個客戶端——服務器框架，它有一個docker程序，既能作為客戶端，也能作為服務器端。作為客戶端時，docker程序向Docker守護進程發送請求（如請求返回守護進程自身的信息），然后再對請求結果進行處理
- 列出鏡像
docker images
wangande@wangande-MS-7808:~$ sudo docker images
REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE
andrew-site v1.0.0 4e51341b8ec2 4 months ago 628 MB
my v2 f8fc45357f55 4 months ago 504.1 MB
鏡像從倉庫下載下來，鏡像保存在倉庫中，倉庫存在于Registry，默認的Registry是由docker公司運營的Registry服務，即docker hub
本地鏡像保存在docker宿主機的/var/lib/docker目錄下，每個鏡像都保存在docker所采用的存儲驅動下，如aufs或devicemapper，在/var/lib/docker/containers目錄下可以看到所有的容器
- 拉取鏡像
docker pull ${鏡像名}
docker會從鏡像倉庫中搜索相關鏡像，如果找到，則下載相關鏡像
- 查找鏡像
docker search ${鏡像名}
wangande@ubuntu:~$ sudo docker search ubuntu
NAME DESCRIPTION STARS OFFICIAL AUTOMATED
ubuntu Ubuntu is a Debian-based Linux operating s... 4629 [OK]
ubuntu-upstart Upstart is an event-based replacement for ... 66 [OK]
rastasheep/ubuntu-sshd Dockerized SSH service, built on top of of... 37 [OK]
torusware/speedus-ubuntu Always updated official Ubuntu docker imag... 27 [OK]
ubuntu-debootstrap debootstrap --variant=minbase --components... 25 [OK]
nickistre/ubuntu-lamp LAMP server on Ubuntu 8 [OK]
nuagebec/ubuntu Simple always updated Ubuntu docker images... 8 [OK]
nickistre/ubuntu-lamp-wordpress LAMP on Ubuntu with wp-cli installed 6 [OK]
nimmis/ubuntu This is a docker images different LTS vers... 5 [OK]
maxexcloo/ubuntu Base image built on Ubuntu with init, Supe... 2 [OK]
darksheer/ubuntu Base Ubuntu Image -- Updated hourly 1 [OK]
admiringworm/ubuntu Base ubuntu images based on the official u... 1 [OK]
jordi/ubuntu Ubuntu Base Image 1 [OK]
datenbetrieb/ubuntu custom flavor of the official ubuntu base ... 0 [OK]
lynxtp/ubuntu https://github.com/lynxtp/docker-ubuntu 0 [OK]
dorapro/ubuntu ubuntu image 0 [OK]
webhippie/ubuntu Docker images for ubuntu 0 [OK]
croscon/ubuntu Crosconized Ubuntu 0 [OK]
life360/ubuntu Ubuntu is a Debian-based Linux operating s... 0 [OK]
esycat/ubuntu Ubuntu LTS 0 [OK]
widerplan/ubuntu Our basic Ubuntu images. 0 [OK]
teamrock/ubuntu TeamRock's Ubuntu image configured with AW... 0 [OK]
ustclug/ubuntu ubuntu image for docker with USTC mirror 0 [OK]
konstruktoid/ubuntu Ubuntu base image 0 [OK]
smartentry/ubuntu ubuntu with smartentry 0 [OK]
wangande@ubuntu:~$
在docker hub上查找所有的ubuntu鏡像
返回信息:
倉庫名
鏡像描述
用戶評價(Stars)——反應出一個鏡像的受歡迎程度
是否官方(Official)
自動構建(Automated)——表示這個鏡像是由Docker Hub的自動構建的
- 運行容器
docker run -i -t ${鏡像名}: ${tag} /bin/bash
1、告訴docker執行docker run命令
2、-i保證容器中的STDIN是開啟的（持久化輸入是shell的半邊天）
3、-t告訴容器要為其分配一個偽TTY終端（shell的另外半邊天）
注：可以使用docker help run 或者man docker run 查看相關標志參數
4、基于andrew-site:v1.0.0鏡像創建容器
5、docker在新容器中運行/bin/bash命令，啟動一個Bash shell
過程：
（1）docker首先檢查本地是否存在andrew-site:v1.0.0鏡像，如果本地沒有該鏡像的話，那么docker就會連接到Registry，查看是否存在該鏡像
（2）docker一旦找到該鏡像，就會下載該鏡像并將其保存到本地宿主機中
（3）隨后，docker在文件系統內部有這個鏡像創建一個新容器，該容器擁有自己的網絡，IP地址，以及一個用來和宿主機通信的橋接網絡接口
（4）最后告訴docker在新容器中運行/bin/bash命令，啟動一個Bash shell
- 容器命名
docker會為我們創建的每一個容器自動生成一個隨機的名稱，如 adoring_hopper, 如果想為容器指定一個名稱，可以使用--name標志來實現
wangande@wangande-MS-7808:~/python-workspace/web-site$ sudo docker run --name name_test -i -t andrew-site:v1.0.0 /bin/bash
root@6eab7fdaab3e:/andrewSite#
上述命令會創建一個名為name_test 的容器，合法的命名包含以下字符：小寫字母a-z，大寫字母A-Z，數字0-9，下劃線、圓點、橫線
正則[a-zA-Z0-9_.-]
容器的命名必須是唯一的。如果我們創建2個名稱相同的容器，則命名將會失敗
- 重新啟動已停止的容器
docker start ${容器名稱}/${容器iD}
wangande@wangande-MS-7808:~/python-workspace/web-site$ sudo docker start name_test
name_test
也可以使用
docker restart ${容器名稱}/${容器iD}
wangande@wangande-MS-7808:~/python-workspace/web-site$ sudo docker restart name_test
name_test
- 附著到容器上
docker attach ${容器名稱}/${容器iD}
wangande@wangande-MS-7808:~/python-workspace/web-site$ sudo docker attach name_test
root@6eab7fdaab3e:/andrewSite#
- 創建守護進程式的容器
docker run -d ${鏡像名}: ${tag}
wangande@wangande-MS-7808:~/python-workspace/web-site$ sudo docker run --name daemon_test -d andrew-site:v1.0.0
991c0927c9b1cb1fb51e34a1ae0cd364dbbadd47d9a5687c7db7363c5170d777
wangande@wangande-MS-7808:~/python-workspace/web-site$ sudo docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
991c0927c9b1 andrew-site:v1.0.0 "/bin/sh -c 'python /" 7 seconds ago Up 6 seconds 80/tcp daemon_test
-d 將容器保持在后臺運行（前提容器里程序不能退出）
- 查看容器運行日志
docker logs ${容器名稱}/${容器iD}
wangande@wangande-MS-7808:~/python-workspace/web-site$ sudo docker logs daemon_test
[E 160906 07:40:16 services_start:33] current server address: 172.17.0.2:80
[I 160906 07:40:16 locale:140] Supported locales: ['en_US', 'ja_JP', 'zh_CN']
docker 會輸出最后幾條日志項并返回，也可以使用-f參數監控docker日志，與tail -f 命令相似
docker logs -f ${容器名稱}/${容器iD}
wangande@wangande-MS-7808:~/python-workspace/web-site$ sudo docker logs -f daemon_test
[E 160906 07:40:16 services_start:33] current server address: 172.17.0.2:80
[I 160906 07:40:16 locale:140] Supported locales: ['en_US', 'ja_JP', 'zh_CN']
也可以跟蹤容器日志的某一片段，只需要在tail 后面加入-f --lines
如：
（1）docker logs --tail 10 -f ${容器名稱}/${容器iD} 獲取日志的最后十行
wangande@wangande-MS-7808:~/python-workspace/web-site$ sudo docker logs --tail 10 -f daemon_test
[I 160906 07:40:16 locale:140] Supported locales: ['en_US', 'ja_JP', 'zh_CN']
（2）docker logs --tail 0 -f ${容器名稱}/${容器iD} 跟蹤容器的最新日志
wangande@wangande-MS-7808:~/python-workspace/web-site$ sudo docker logs --tail 0 -f daemon_test
為了調試更簡單，我們還可以使用-t標志為每條日志項加上時間戳
docker logs -ft ${容器名稱}/${容器iD}
wangande@wangande-MS-7808:~/python-workspace/web-site$ sudo docker logs -ft daemon_test
2016-09-06T07:40:16.712357005Z [E 160906 07:40:16 services_start:33] current server address: 172.17.0.2:80
2016-09-06T07:40:16.731046798Z [I 160906 07:40:16 locale:140] Supported locales: ['en_US', 'ja_JP', 'zh_CN']
- 查看容器內的進程
docker top ${容器名稱}/${容器iD}
wangande@wangande-MS-7808:~/python-workspace/web-site$ sudo docker top daemon_test
UID PID PPID C STIME TTY TIME CMD
root 13815 1508 0 15:40 ? 00:00:00 /bin/sh -c python /andrewSite/manage.py --port=80
root 13825 13815 0 15:40 ? 00:00:00 python /andrewSite/manage.py --port=80
- 在容器內部運行進程
在容器內部運行后臺進程
docker exec -d ${容器名稱}/${容器iD} touch /tmp/new_file
wangande@wangande-MS-7808:~/python-workspace/web-site$ sudo docker exec -d daemon_test touch /tmp/new_file
wangande@wangande-MS-7808:~/python-workspace/web-site$
在容器內部運行交互命令
docker exec -i -t ${容器名稱}/${容器iD} /bin/bash
wangande@wangande-MS-7808:~/python-workspace/web-site$ sudo docker exec -i -t daemon_test /bin/bash
root@991c0927c9b1:/andrewSite#
- 停止守護式容器
docker stop ${容器名稱}/${容器iD}
wangande@wangande-MS-7808:~/python-workspace/web-site$ sudo docker stop daemon_test
daemon_test
注：docker stop 命令會向容器進程發送SIGTERM信號，如果想快速停止可以使用docker kill發送SIGKILL信號
- 查看容器
docker ps （顯示正在運行的docker）
wangande@wangande-MS-7808:~/python-workspace/web-site$ sudo docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
991c0927c9b1 andrew-site:v1.0.0 "/bin/sh -c 'python /" 9 minutes ago Up 2 seconds 80/tcp daemon_test
docker ps -a (顯示所有docker，包括已退出)
wangande@wangande-MS-7808:~/python-workspace/web-site$ sudo docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
991c0927c9b1 andrew-site:v1.0.0 "/bin/sh -c 'python /" 9 minutes ago Up 18 seconds 80/tcp daemon_test
6eab7fdaab3e andrew-site:v1.0.0 "/bin/bash" 25 minutes ago Exited (0) 15 minutes ago name_test
1e700c32e95c i71:5000/isee-video-yixun:v4.1.5.30 "/bin/bash" 10 weeks ago Exited (0) 9 weeks ago desperate_mccarthy
9166129e6105 andrew-site:v1.0.0 "/bin/sh -c 'python /" 11 weeks ago Exited (137) 11 weeks ago daemon1
229d18a74ec5 andrew-site:v1.0.0 "-d -p 20000:80" 11 weeks ago Created daemon
5affe32960c7 andrew-site:v1.0.0 "/bin/bash" 12 weeks ago Exited (0) 12 weeks ago my_name_test
5dc39a01d48b i71:5000/isee-file "/bin/bash" 12 weeks ago Exited (0) 12 weeks ago adoring_hopper
c30c288cccc2 i71:5000/isee-file "/bin/bash" 12 weeks ago Exited (0) 12 weeks ago evil_lichterman
73b7a25539f0 i71:5000/isee-resize "ImageCompress /bin/b" 12 weeks ago Exited (1) 12 weeks ago backstabbing_albattani
04549918fcb4 andrew-site:v1.0.0 "/bin/bash" 3 months ago Exited (0) 12 weeks ago serene_lalande
c89e85466d2f andrew-site:v1.0.0 "/bin/sh -c 'python /" 3 months ago Exited (1) 3 months ago clever_kalam
fbe4e3780598 andrew-site:v1.0.0 "/bin/bash" 3 months ago Exited (130) 3 months ago test-site
0e1a8ff5c52c andrew-site:v1.0.0 "/bin/bash" 4 months ago Exited (0) 4 months ago big_dijkstra
da0b188806a8 andrew-site:v1.0.0 "/bin/bash" 4 months ago Exited (130) 4 months ago jovial_lamarr
98d97845c3d7 i71:5000/isee-sms-yixun:v4.1.4.55 "/bin/sh -c 'python /" 4 months ago Exited (137) 4 months ago stoic_rosalind
7b6b75db6d8d andrew-site:v1.0.0 "/bin/sh -c 'python /" 4 months ago Exited (137) 4 months ago elated_pasteur
6a3ee17b8f5b andrew-site:v1.0.0 "/bin/sh -c 'python /" 4 months ago Created goofy_thompson
98d6fec1de29 andrew-site:v1.0.0 "/bin/sh -c 'python /" 4 months ago Created nostalgic_swanson
c96bce8edcae andrew-site:v1.0.0 "/bin/sh -c 'python /" 4 months ago Created gloomy_goldberg
edbb85621f6e andrew-site:v1.0.0 "/bin/sh -c 'python /" 4 months ago Created stupefied_heisenberg
314d7a7d7fac andrew-site:v1.0.0 "/bin/sh -c 'python /" 4 months ago Exited (137) 4 months ago serene_pike
27cb093780b1 andrew-site:v1.0.0 "/bin/sh -c 'p
docker ps -l （顯示最后一個）
wangande@wangande-MS-7808:~/python-workspace/web-site$ sudo docker ps -l
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
991c0927c9b1 andrew-site:v1.0.0 "/bin/sh -c 'python /" 9 minutes ago Up 39 seconds 80/tcp daemon_test
docker ps -n x(顯示最后x個容器)
wangande@wangande-MS-7808:~/python-workspace/web-site$ sudo docker ps -n 5
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
991c0927c9b1 andrew-site:v1.0.0 "/bin/sh -c 'python /" 10 minutes ago Up About a minute 80/tcp daemon_test
6eab7fdaab3e andrew-site:v1.0.0 "/bin/bash" 26 minutes ago Exited (0) 16 minutes ago name_test
1e700c32e95c i71:5000/isee-video-yixun:v4.1.5.30 "/bin/bash" 10 weeks ago Exited (0) 9 weeks ago desperate_mccarthy
9166129e6105 andrew-site:v1.0.0 "/bin/sh -c 'python /" 11 weeks ago Exited (137) 11 weeks ago daemon1
229d18a74ec5 andrew-site:v1.0.0 "-d -p 20000:80" 11 weeks ago Created daemon
wangande@wangande-MS-7808:~/python-workspace/web-site$
- 自動重啟docker
由于某種錯誤導致容器停止運行，可以通過--restart 標志，讓docker自動重啟。
--restart 標志會檢查容器的退出代碼，并根據此來決定是否重啟容器，默認docker不會重啟容器
sudo docker run --restart=always --name daemon_test andrew-site:v1.0.0
--restart 被設置為always,無論退出代碼是什么都會重啟
還可以將標志設置為on-failure 這樣當容器退出代碼為非0時，才會自動重啟
on-failure還可以接受可選的重啟次數如：--restart=on-failure:5
- 深入容器
除了通過docker ps ，還可以通過docker inspect獲取更多的容器信息
docker inspect ${容器名稱}/${容器iD}
wangande@wangande-MS-7808:~/python-workspace/web-site$ sudo docker inspect daemon_test
[
{
"Id": "991c0927c9b1cb1fb51e34a1ae0cd364dbbadd47d9a5687c7db7363c5170d777",
"Created": "2016-09-06T07:40:16.363206933Z",
"Path": "/bin/sh",
"Args": [
"-c",
"python /andrewSite/manage.py --port=80"
],
"State": {
"Status": "running",
"Running": true,
"Paused": false,
"Restarting": false,
"OOMKilled": false,
"Dead": false,
"Pid": 14068,
"ExitCode": 0,
"Error": "",
"StartedAt": "2016-09-06T07:49:33.647550223Z",
"FinishedAt": "2016-09-06T07:48:47.666181288Z"
},
"Image": "4e51341b8ec2db42cf656162884972c58f07ea29cdcbda10696db11984c65191",
..........................
}
]
通過-f 或者--format選定查看結果
docker inspect -f='{{.State.Running}}' ${容器名稱}/${容器iD}
wangande@wangande-MS-7808:~/python-workspace/web-site$ sudo docker inspect -f='{{.State.Running}}' daemon_test
true
返回容器的運行狀態
docker inspect --format '{{.Name}} {{.State.Running}}' ${容器名稱}/${容器iD} ${容器名稱}/${容器iD}
wangande@wangande-MS-7808:~/python-workspace/web-site$ sudo docker inspect --format '{{.Name}} {{.State.Running}}' daemon_test name_test
/daemon_test true
/name_test false
同時指定多個容器，并顯示每個容器的輸出結果
- 刪除容器
如果容器不使用我們可以使用docker rm命令刪除它們
docker rm ${容器名稱}/${容器iD}
wangande@wangande-MS-7808:~/python-workspace/web-site$ sudo docker rm 9166129e6105
9166129e6105
注：運行中的容器無法刪除，必須使用docker stop 或者docker kill命令停止容器
wangande@wangande-MS-7808:~/python-workspace/web-site$ sudo docker rm 991c0927c9b1
Error response from daemon: Conflict, You cannot remove a running container. Stop the container before attempting removal or use -f
Error: failed to remove containers: [991c0927c9b1]
wangande@wangande-MS-7808:~/python-workspace/web-site$ sudo docker stop 991c0927c9b1
991c0927c9b1
wangande@wangande-MS-7808:~/python-workspace/web-site$
wangande@wangande-MS-7808:~/python-workspace/web-site$
wangande@wangande-MS-7808:~/python-workspace/web-site$ sudo docker rm 991c0927c9b1
991c0927c9b1
目前還沒有一次刪除所有容器的命令，不過可以通過如下代碼刪除
sudo docker rm `docker ps -a -q`
-a 列出所有容器
-q 表示只返回容器的ID而不返回容器的其它信息
這樣我們就可以得到容器的列表，并傳給docker rm命令，達到刪除所有容器目的
