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部署维护docker环境的详细教程

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[运维安全 所属分类 运维安全 | 发布者 店小二05 | 时间 | 作者 红领巾 ] 0人收藏点击收藏

1,安装环境说明

系统环境:centos6.6

服务应用了:  haproxy  confd   etcd   docker

主机名               ip      服务角色
dockerha-152      192.168.36.152    haproxy confd
dockerEtcd-153     192.168.36.153      etcd

dockermain-154    192.168.36.154    docker

2,安装依懒包,关闭冲突的服务

官方文档要求linux kernel至少3.8以上,且docker只能运行在64位的系统中。由于RHEL6和CentOS6的内核版本为2.6,因此必须要先升级内核。

cd /etc/yum.repos.d
wget http://www.hop5.in/yum/el6/hop5.repo
yum install kernel-ml-aufs kernel-ml-aufs-devel -y

修改grub的主配置文件/etc/grub.conf,设置default=0,表示第一个title下的内容为默认启动的kernel(一般新安装的内核在第一个位置)。

然后重启,重启系统,这时候你的内核就成功升级了,版本应该在3.8以上了,

uname -r
[[email protected] shell]# uname -r

3.10.5-3.el6.x86_64

sed -i '/^SELINUX=/c\SELINUX=disabled' /etc/selinux/config
setenforce 0

在Fedora EPEL源中已经提供了docker-io包,下载安装epel:

rpm -ivh http://mirrors.sohu.com/fedora-epel/6/x86_64/epel-release-6-8.noarch.rpm
sed -i 's/^mirrorlist=https/mirrorlist=http/' /etc/yum.repos.d/epel.repo

3,安装组件

(1)haproxy confd

dockerha-152上操作

1、haproxy 

# yum Cy install haproxy

2、confd 

# wget https://github.com/kelseyhightower/confd/releases/download/v0.6.3/confd-0.6.3-linux-amd64
# mv confd /usr/local/bin/confd
# chmod +x /usr/local/bin/confd
# /usr/local/bin/confd -version

(2)etcd

dockerEtcd-153上操作

# mkdir -p /home/install && cd /home/install
# wget https://github.com/coreos/etcd/releases/download/v0.4.6/etcd-v0.4.6-linux-amd64.tar.gz
# tar -zxvf etcd-v0.4.6-linux-amd64.tar.gz
# cd etcd-v0.4.6-linux-amd64
# cp etcd* /bin/
# /bin/etcd -version
etcd version 0.4.6

(3)Docker

# yum -y install docker-io
# service docker start
# chkconfig docker on

4,docker命令使用

(1)查看帮助

docker COMMAND --help

(2)搜索可用的境像

docker search name 如示例:

[[email protected] src]# docker search centos
NAME DESCRIPTION STARS OFFICIAL AUTOMATED
centos The official build of CentOS. 817 [OK]
ansible/centos7-ansible Ansible on Centos7 30 [OK]
tutum/centos Centos image with SSH access. For the root... 13 [OK]
jdeathe/centos-ssh-apachephp CentOS-6 6.5 x86_64 / Apache / PHP / PHP m... 8 [OK]
blalor/centos Bare-bones base CentOS 6.5 image 8 [OK]
jprjr/centos-php-fpm 6 [OK]
steeef/graphite-centos CentOS 6.x with Graphite and Carbon via ng... 6 [OK]
tutum/centos-6.4 DEPRECATED. Use tutum/centos:6.4 instead. ... 5 [OK]
layerworx/centos A general CentOS 6 image with the EPEL6 an... 2 [OK]
jr42/chef-solo-centos Official CentOS base images with current c... 1 [OK]
million12/centos-supervisor Base CentOS-7 with supervisord launcher, h... 1 [OK]
internavenue/centos-percona Centos-based Percona image. 1 [OK]
jdeathe/centos-ssh CentOS-6 6.5 x86_64 / EPEL Repo. / OpenSSH... 1 [OK]
jdeathe/centos-ssh-mysql CentOS-6 6.5 x86_64 / MySQL. Image include... 1 [OK]
yajo/centos-epel CentOS with EPEL and fully updated 1 [OK]
nimmis/java-centos This is docker images of CentOS 7 with dif... 0 [OK]
lighthopper/orientdb-centos A Dockerfile for creating an OrientDB imag... 0 [OK]
bbrietzke/centos-starter CentOS 7 with EPEL and SupervisorD 0 [OK]
tcnksm/centos-node Dockerfile for CentOS packaging node 0 [OK]
insaneworks/centos CentOS 6.5 x86_64 + @update 0 [OK]
snowyday/centos Provide for emacs and Ricty font on X11 en... 0 [OK]
dmglab/centos CentOS with superpowers! 0 [OK]
akroh/centos Centos 6 container that has been updated w... 0 [OK]
timhughes/centos Centos with systemd installed and running 0 [OK]
solict/provisionous-puppet-centos CentOS provisions with Puppet included 0 [OK]

(3)下载镜像

注意镜像名称要写全,就是用docker search name 搜出来的NAME列的名称。

docker pull name 如示例:

[[email protected] src]# docker pull jdeathe/centos-ssh-apache-php
Pulling repository jdeathe/centos-ssh-apache-php
........
62203f428b1f: Download complete
e1812755a4ca: Download complete
0910edda3736: Download complete
Status: Downloaded newer image for jdeathe/centos-ssh-apache-php:latest

(4)查看已安装的镜像

[[email protected] src]# docker images
REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE
centos latest dade6cb4530a 10 days ago 210.1 MB
jdeathe/centos-ssh-apache-php latest f1a489312a4a 3 months ago 297.7 MB

(5)docker容器中运行命令

docker run命令有两个参数,一个是镜像名,一个是要在镜像中运行的命令。 注意:IMAGE=REPOSITORY[:TAG],如果IMAGE参数不指定镜像的TAG,默认TAG为latest。
[[email protected] run]# sudo docker run jdeathe/centos-ssh-apache-php echo 'hello world!'
hello world!
[[email protected] run]# sudo docker run jdeathe/centos-ssh-apache-php hostname
db7e1d2269fb

(6)列出容器

 查看最近生成的容器:docker ps -l

 查看正在运行的容器:docker ps

[[email protected] run]# docker ps -l
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
db7e1d2269fb jdeathe/centos-ssh-apache-php:latest "hostname" 27 seconds ago Exited (0) 26 seconds ago adoring_babbage

(7)显示容器标准输出

[[email protected] run]# docker ps -l
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
db7e1d2269fb jdeathe/centos-ssh-apache-php:latest "hostname" 27 seconds ago Exited (0) 26 seconds ago adoring_babbage
[[email protected] run]# docker logs db7e1d2269fb
db7e1d2269fb

(8)给容器中安装程序或服务

[[email protected] run]# sudo docker run centos yum install -y httpd
Loaded plugins: fastestmirror
..........

Dependency Installed:

apr.x86_64 0:1.4.8-3.el7
apr-util.x86_64 0:1.5.2-6.el7
centos-logos.noarch 0:70.0.6-1.el7.centos
httpd-tools.x86_64 0:2.4.6-19.el7.centos
mailcap.noarch 0:2.1.41-2.el7

Failed:

  httpd.x86_64 0:2.4.6-19.el7.centos                                           

Complete!

(9)保存对容器中的修改并生成新的镜像

docker commit CONTAINERID [REPOSITORY[:TAG]]

REPOSITORY参数可以是新的镜像名字,也可以是旧的镜像名;如果和旧的镜像名和TAG都相同,会覆盖掉旧的镜像。

[[email protected] ~]# docker commit bd7cc4f4ac92 centos:httpd
1e0915f3247b86414ebc11fd994fc6abfb590ff3b1ab890949c845ee88b2d9f4
[[email protected] ~]# docker images
REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE
centos httpd 1e0915f3247b 9 seconds ago 320.8 MB
centos latest dade6cb4530a 10 days ago 210.1 MB
jdeathe/centos-ssh-apache-php latest f1a489312a4a 3 months ago 297.7 MB
(10)停止正在运行的容器 

(11)查看容器或镜像详情

下面是我刚保存提交产生的新的容器

[[email protected] ~]# docker inspect 943e45b6e5f3
[{
"AppArmorProfile": "",
"Args": [],
"Config": {
"AttachStderr": true,
"AttachStdin": true,
"AttachStdout": true,
"Cmd": [
"/bin/bash"
],
"CpuShares": 0,
"Cpuset": "",
"Domainname": "",
"Entrypoint": null,
"Env": [
"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
],
"ExposedPorts": null,
"Hostname": "943e45b6e5f3",
"Image": "centos:httpd",
"MacAddress": "",
"Memory": 0,
"MemorySwap": 0,
"NetworkDisabled": false,
"OnBuild": null,
"OpenStdin": true,
"PortSpecs": null,
"StdinOnce": true,
"Tty": true,
"User": "",
"Volumes": null,
"WorkingDir": ""
},

(12)删除容器

docker rm CONTAINERID

查看所有容器ID:docker ps -a -q

删除所有的容器:docker rm $(docker ps -a -q)

(13)删除镜像

docker rmi IMAGE

(14)查看docker的信息,包括Containers和Images数目、kernel版本等

[[email protected] ~]# docker info
Containers: 14
Images: 56
Storage Driver: aufs
Root Dir: /var/lib/docker/aufs
Dirs: 89
Execution Driver: native-0.2
Kernel Version: 3.10.5-3.el6.x86_64
Operating System: <unknown>
CPUs: 1
Total Memory: 989.6 MiB
Name: dockermain-154
ID: W4PW:W3XR:FQZE:SBAA:2DS2:BM6N:DV5B:ARF2:3SZM:XGST:5ZF7:DFZV
WARNING: No swap limit support

(15)创建容器,并像平常ssh登录一样使用

[[email protected] ~]# docker run -i -t centos /bin/bash
[[email protected] /]# ls
bin dev etc home lib lib64 lost+found media mnt opt proc root run sbin selinux srv sys tmp usr var

以上所述是小编给大家介绍的部署维护docker环境的详细教程,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对脚本之家网站的支持!

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