Docker安装及错误解决方案

1  关闭selinux

[ffffdd@v069208183.sqa.zmf /home/admin/]
$sudo setenforce 0
setenforce: SELinux is disabled
[ffffdd@v069208183.sqa.zmf /home/admin/]
$sudo sed -i '/^SELINUX=/c\SELINUX=disabled' /etc/selinux/config

2  安装epel

[ffffdd@v069208183.sqa.zmf /]
$sudo rpm -ivh http://mirrors.sohu.com/fedora-epel/6/x86_64/epel-release-6-8.noarch.rpm
Retrieving http://mirrors.sohu.com/fedora-epel/6/x86_64/epel-release-6-8.noarch.rpm
warning: /var/tmp/rpm-tmp.NNZYOY: Header V3 RSA/SHA256 Signature, key ID 0608b895: NOKEY
Preparing... ########################################### [100%]
1:epel-release ########################################### [100%]
[ffffdd@v069208183.sqa.zmf /]
$sudo sed -i 's/^mirrorlist=https/mirrorlist=http/' /etc/yum.repos.d/epel.repo

3  docker-io安装

[ffffdd@v069208183.sqa.zmf /]
$sudo yum -y install docker-io

成功安装：

4  docker启动错误

启动的过程发生故障，启动失败

[ffffdd@v069208183.sqa.zmf /]
$sudo service docker start
Starting cgconfig service: [ OK ]
Starting docker: [ OK ]
[ffffdd@v069208183.sqa.zmf /]
$docker version
Client version: 1.7.1
Client API version: 1.19
Go version (client): go1.4.2
Git commit (client): 786b29d/1.7.1
OS/Arch (client): linux/amd64
Get http:///var/run/docker.sock/v1.19/version: dial unix /var/run/docker.sock: permission denied. Are you trying to connect to a TLS-enabled daemon without TLS?

查看docker日志，docker日志地址为/var/log/docker：

$cat /var/log/docker
\nSat Jun 25 18:54:55 CST 2016\n
time="2016-06-25T18:54:56.013084200+08:00" level=info msg="Listening for HTTP on unix (/var/run/docker.sock)"
time="2016-06-25T18:54:56.206980482+08:00" level=warning msg="Running modprobe bridge nf_nat failed with message: insmod /lib/modules/3.10.5-3.el6.x86_64/kernel/net/llc/llc.ko \ninsmod /lib/modules/3.10.5-3.el6.x86_64/kernel/net/802/stp.ko \ninsmod /lib/modules/3.10.5-3.el6.x86_64/kernel/net/ipv6/ipv6.ko disable=1\ninsmod /lib/modules/3.10.5-3.el6.x86_64/kernel/net/bridge/bridge.ko \ninsmod /lib/modules/3.10.5-3.el6.x86_64/kernel/net/netfilter/nf_conntrack.ko \ninsmod /lib/modules/3.10.5-3.el6.x86_64/kernel/net/netfilter/nf_nat.ko \n, error: exit status 1"
time="2016-06-25T18:54:56.380986865+08:00" level=fatal msg="Error starting daemon: Error initializing network controller: Error creating default \"bridge\" network: can't find an address range for interface \"docker0\""

问题原因

docker为docker0接口选择了一个172.17.42.1的IP，恰好ECS占用了172.16.0.0/255.240.0.0

解决方案（两种）

方案一

修改/etc/default/docker，添加DOCKER_OPTS=”–bip=192.168.17.1/24”，重启就可以了

方法一说明，在/etc/default/docker文件中新增记录DOCKER_OPTS=”–bip=192.168.17.1/24”

[xiaolong.xiao@v069208183.sqa.zmf /var/log]
$sudo vi /etc/default/docker
Error detected while processing /root/.vimrc:
line 16:
E518: Unknown option: foldlevel=100
Press ENTER or type command to continue

方案二

启动docker服务在指定的网段

5  docker版本查看

利用命令docker version

[ffffdd@v069208183.sqa.zmf /var/log]
$sudo docker version
Client version: 1.7.1
Client API version: 1.19
Go version (client): go1.4.2
Git commit (client): 786b29d/1.7.1
OS/Arch (client): linux/amd64
Server version: 1.7.1
Server API version: 1.19
Go version (server): go1.4.2
Git commit (server): 786b29d/1.7.1
OS/Arch (server): linux/amd64

6  docker启动

sudo chkconfig docker on