阿里云安装docker
记录阿里云搭建docker碰到的问题
阿里云搭建docker和本地有一点点区别，当安装成功后发现docker报错，如下：
Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?
- /var/run/docker.sock is up
- time="2017-09-20T19:43:04.189684169+08:00" level=info msg="libcontainerd: new containerd process, pid: 17504"
- time="2017-09-20T19:43:05.195018039+08:00" level=info msg="[graphdriver] using prior storage driver: aufs"
- time="2017-09-20T19:43:05.202361669+08:00" level=info msg="Graph migration to content-addressability took 0.00 seconds"
- time="2017-09-20T19:43:05.202628053+08:00" level=warning msg="Your kernel does not support swap memory limit"
- time="2017-09-20T19:43:05.202683626+08:00" level=warning msg="Your kernel does not support cgroup rt period"
- time="2017-09-20T19:43:05.202699519+08:00" level=warning msg="Your kernel does not support cgroup rt runtime"
- time="2017-09-20T19:43:05.202842112+08:00" level=warning msg="mountpoint for pids not found"
- time="2017-09-20T19:43:05.203338693+08:00" level=info msg="Loading containers: start."
- Error starting daemon: Error initializing network controller: list bridge addresses failed: no available network
- /var/run/docker.sock is up
- time="2017-09-20T19:43:05.344214220+08:00" level=info msg="libcontainerd: new containerd process, pid: 17581"
- time="2017-09-20T19:43:06.349392877+08:00" level=info msg="[graphdriver] using prior storage driver: aufs"
- time="2017-09-20T19:43:06.354159926+08:00" level=info msg="Graph migration to content-addressability took 0.00 seconds"
- time="2017-09-20T19:43:06.354370574+08:00" level=warning msg="Your kernel does not support swap memory limit"
- time="2017-09-20T19:43:06.354434193+08:00" level=warning msg="Your kernel does not support cgroup rt period"
- time="2017-09-20T19:43:06.354450955+08:00" level=warning msg="Your kernel does not support cgroup rt runtime"
- time="2017-09-20T19:43:06.354525824+08:00" level=warning msg="mountpoint for pids not found"
- time="2017-09-20T19:43:06.355017538+08:00" level=info msg="Loading containers: start."
- Error starting daemon: Error initializing network controller: list bridge addresses failed: no available network
- /var/run/docker.sock is up
可以发现是网络有问题，然后用ifconfig查看，果然没有docker0这块虚拟网卡。
那么，在阿里云中为什么会启动失败呢？在Docker的源代码搜索上述错误信息，可以看出问题出在createBridge这个函数中。
该函数会检查下列IP段
- var addrs = []string{
- “172.17.42.1/16”,
- “10.0.42.1/16”,
- “10.1.42.1/16”,
- “10.42.42.1/16”,
- “172.16.42.1/24”,
- “172.16.43.1/24”,
- “172.16.44.1/24”,
- “10.0.42.1/24”,
- “10.0.43.1/24”,
- “192.168.42.1/24”,
- “192.168.43.1/24”,
- “192.168.44.1/24”,
- }
对于每个IP段，Docker会检查它是否和当前机器的域名服务器或路由表有重叠，如果有的话，就放弃该IP段。
让我们看看阿里云服务器的路由表
- root@iZ:/home/docker# route -n
- Kernel IP routing table
- Destination Gateway Genmask Flags Metric Ref Use Iface
- 0.0.0.0 114.55.11.247 0.0.0.0 UG 0 0 0 eth1
- 10.0.0.0 10.45.55.247 255.0.0.0 UG 0 0 0 eth0
- 10.45.52.0 0.0.0.0 255.255.252.0 U 0 0 0 eth0
- 100.64.0.0 10.45.55.247 255.192.0.0 UG 0 0 0 eth0
- 114.55.8.0 0.0.0.0 255.255.252.0 U 0 0 0 eth1
- 172.16.0.0 10.45.55.247 255.240.0.0 UG 0 0 0 eth0
- 192.168.0.0 10.45.55.247 255.255.0.0 UG 0 0 0 eth0
把路由表中不用的项删除，这样Docker就能找到能用的IP段了：
- sudo route del -net 172.16.0.0/12
好了问题解决
这时候可以用docker images查看镜像信息了：
- root@iZ:/home/docker# docker images
- REPOSITORY ? ? ? ? ?TAG ? ? ? ? ? ? ? ? IMAGE ID ? ? ? ? ? ?CREATED ? ? ? ? ? ? SIZE
总结
以上为个人经验，希望能给大家一个参考，也希望大家多多支持w3xue。
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