docker 安装要求内核大于3.10 ， 而centos6 机器上内核一般是2.6 ， 除了升级内核外， 还可以安装低版本的docker ， 本文介绍docker 1.7的安装。

机器 环境

[root@node202 docker]# uname -a

Linux node202.hmbank.com 2.6.-.el6.x86_64 # SMP Wed Jul  :: EDT  x86_64 x86_64 x86_64 GNU/Linux

[root@node202 docker]# cat /etc/system-release

Red Hat Enterprise Linux Server release 6.7 (Santiago)

添加epel源

rpm -iUvh http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm

安装

yum -y install docker-io
=======================================================================================================================================================================================

 Package                                         Arch                                    Version                                           Repository                             Size

=======================================================================================================================================================================================

Installing:

 docker-io                                       x86_64                                  1.7.-.el6                                       epel                                  4.6 M

Installing for dependencies:

 libcgroup                                       x86_64                                  0.40.rc1-.el6                                   base                                   k

 lua-alt-getopt                                  noarch                                  0.7.-.el6                                       epel                                  6.9 k

 lua-filesystem                                  x86_64                                  1.4.-.el6                                       epel                                    k

 lua-lxc                                         x86_64                                  1.0.-.el6                                      epel                                    k

 lxc                                             x86_64                                  1.0.-.el6                                      epel                                   k

 lxc-libs                                        x86_64                                  1.0.-.el6                                      epel                                   k

Transaction Summary

=======================================================================================================================================================================================

Install        Package(s)

报错1

Warning: '-bip' is deprecated, it will be replaced by '--bip' soon. See usage.

INFO[] Listening for HTTP on unix (/var/run/docker.sock)

WARN[] You are running linux kernel version 2.6.-.el6.x86_64, which might be unstable running docker. Please upgrade your kernel to 3.10..

INFO[] [graphdriver] using prior storage driver "devicemapper"

WARN[] Running modprobe bridge nf_nat failed with message: install /bin/true

install /sbin/modprobe --ignore-install bridge && /sbin/sysctl -q -w net.bridge.bridge-nf-call-arptables= net.bridge.bridge-nf-call-iptables= net.bridge.bridge-nf-call-ip6tables=

install /bin/true

insmod /lib/modules/2.6.-.el6.x86_64/kernel/net/bridge/bridge.ko

, error: exit status

FATA[] Error starting daemon: Error initializing network controller: Error creating default "bridge" network: package not installed

modprobe bridge 报错：
centos无法将安装bridge内核模块。

报错2

# 启动docker服务
root@node202 ~]# docker -d

INFO[] Listening for HTTP on unix (/var/run/docker.sock)

WARN[] You are running linux kernel version 2.6.-.el6.x86_64, which might be unstable running docker. Please upgrade your kernel to 3.10..

WARN[] Running modprobe bridge nf_nat failed with message: insmod /lib/modules/2.6.-.el6.x86_64/kernel/net/llc/llc.ko

insmod /lib/modules/2.6.-.el6.x86_64/kernel/net//stp.ko

install /sbin/modprobe --ignore-install bridge && /sbin/sysctl -q -w net.bridge.bridge-nf-call-arptables= net.bridge.bridge-nf-call-iptables= net.bridge.bridge-nf-call-ip6tables=

insmod /lib/modules/2.6.-.el6.x86_64/kernel/net/bridge/bridge.ko

insmod /lib/modules/2.6.-.el6.x86_64/kernel/net/ipv4/netfilter/nf_defrag_ipv4.ko

insmod /lib/modules/2.6.-.el6.x86_64/kernel/net/netfilter/nf_conntrack.ko

insmod /lib/modules/2.6.-.el6.x86_64/kernel/net/ipv4/netfilter/nf_conntrack_ipv4.ko

insmod /lib/modules/2.6.-.el6.x86_64/kernel/net/ipv4/netfilter/nf_nat.ko

, error: exit status

WARN[] Your kernel does not support cgroup memory limit: mountpoint for memory not found

WARN[] mountpoint for cpu not found

FATA[] Error mounting devices cgroup: mountpoint for devices not found

原因： cgroup 在宿主机上没有挂载 。
修改 /etc/fstab
在结尾加上 none /sys/fs/cgroup cgroup defaults 0 0
reboot服务器 。 解决。

配置从私有仓库拉取镜像

    1. 修改 /etc/sysconfig/docker
      最后一行添加：
DOCKER_OPTS="--insecure-registry node205:5000"
    1. 修改 /etc/init.d/docker
      为exec添加上述运行参数 ：
$exec -d $other_args $DOCKER_OPTS &>> $logfile &
  1. 重启 service docker restart

 

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