1.记录一下自己搭建kubernetes 集群遇见的坑。
过程是我学技术以来最大的bug，处处都是坑，稍微写成一点， 就完全起不来， 起不来之后， 还找不到故障点， 郁闷之极。
后续会慢慢分享给大家。
2.kubernetes部署 Flannel网络
1）写入分配的子网段到etcd，供flanneld使用
# etcdctl -endpoint="http://192.168.1.195:2379" set /coreos.com/network/config '{ "Network": "172.17.0.0/16", "Backend": {"Type": "vxlan"}}'
2）下载二进制包
# wget https://github.com/coreos/flannel/releases/download/v0.9.1/flannel-v0.9.1-linux-amd64.tar.gz
# tar zxvf flannel-v0.9.1-linux-amd64.tar.gz
# mv flanneld mk-docker-opts.sh /usr/bin
3）配置Flannel
vi /etc/sysconfig/flanneld
FLANNEL_OPTIONS="--etcd-endpoints=http://192.168.1.195:2379 --ip-masq=true"
4）systemd管理Flannel
# vi /usr/lib/systemd/system/flanneld.service
[Unit]
Description=Flanneld overlay address etcd agent
After=network.target
After=network-online.target
Wants=network-online.target
Before=docker.service
[Service]
Type=notify
EnvironmentFile=/etc/sysconfig/flanneld
ExecStart=/usr/bin/flanneld $FLANNEL_OPTIONS
ExecStartPost=/usr/bin/mk-docker-opts.sh -k DOCKER_NETWORK_OPTIONS -d /run/flannel/subnet.env
Restart=on-failure
[Install]
WantedBy=multi-user.target
RequiredBy=docker.service
5）配置Docker启动指定子网段
修改成如图：
[root@node01 ~]# vi /usr/lib/systemd/system/docker.service
[Service]
Type=notify
# the default is not to use systemd for cgroups because the delegate issues still
# exists and systemd currently does not support the cgroup feature set required
# for containers run by docker
EnvironmentFile=/run/flannel/subnet.env
ExecStart=/usr/bin/dockerd $DOCKER_NETWORK_OPTIONS
#--insecure-reqistry reqistry.jwis.cn
ExecReload=/bin/kill -s HUP $MAINPID