主机信息：
| 主机IP | 主机名 | 角色 |
| 10.10.3.181 | k8s-m1 | kube-apiserver,kube-controller-manager,kube-scheduler,etcd |
| 10.10.3.182 | k8s-n1 | kubelet,kube-proxy,etcd |
| 10.10.3.183 | k8s-n2 | kubelet,kube-proxy,etcd |
| 10.10.3.184 | k8s-n3 | kubelet,kube-proxy |
安装配置ansible
安装
yum install ansible -y
配置
$ vim /etc/ansible/ansible.cfg ...
#去掉这个配置的#号
host_key_checking = False
... #安装自己的情况修改 $ vim /etc/ansible/hosts [kubemaster] 10.10.3.181 hostname=k8s-m1 etcd01ip=10.10.3.181 etcd02ip=10.10.3.182 etcd03ip=10.10.3.183 [kubenode] 10.10.3.182 hostname=k8s-n1 10.10.3.183 hostname=k8s-n2 10.10.3.184 hostname=k8s-n3 [allnode] 10.10.3.181 10.10.3.182 10.10.3.183 10.10.3.184 [allnode:vars] ansible_ssh_user=root ansible_ssh_pass=123 ansible_ssh_port=22 [etcd] 10.10.3.181 etcdname=etcd01 etcd01ip=10.10.3.181 etcd02ip=10.10.3.182 etcd03ip=10.10.3.183 10.10.3.182 etcdname=etcd02 10.10.3.183 etcdname=etcd03
配置免密钥
1.生产密钥
ssh-keygen -t rsa
2.分发密钥
ansible allnode -m authorized_key -a "user=root key='{{lookup('file','/root/.ssh/id_rsa.pub')}}'"
安装kubernetes
修改主机名
$ ansible allnode -m hostname -a 'name={{ hostname }}'
git clone
$ git clone https://github.com/jaxzhai/kubernetes-ansible.git
修改kubernetes-ansible/group_vars/all.yaml参数
1、修改ETCD_URL。修改成自己规划的IP即可
2、修改ETCD_ENDPOINTS。修改成自己规划的IP即可
3、修改IFACE。既网卡的名称
开始运行安装
1、setup.yaml
这里我们选择升级到最新内核
ansible-playbook setup.yaml -e kernel=ture
2、ca.yaml
创建我们所需要的所有证书
ansible-playbook ca.yaml
3、kubectl.yaml
创建kubectl，如果手动下载的话加上download=false标签。自己下载kubernetes-server-linux-amd64.tar.gz到role/kubectl/files目录下
ansible-playbook kubectl.yaml -e download=false
4、etcd.yaml
ansible-playbook etcd.yaml
查看状态
$ ETCDCTL_API=3 etcdctl -w table --cacert=/etc/kubernetes/pki/ca.pem --cert=/etc/kubernetes/pki/etcd.pem --key=/etc/kubernetes/pki/etcd-key.pem --endpoints=https://10.10.3.181:2379,https://10.10.3.182:2379,https://10.10.3.183:2379 endpoint status +--------------------------+------------------+---------+---------+-----------+-----------+------------+ | ENDPOINT | ID | VERSION | DB SIZE | IS LEADER | RAFT TERM | RAFT INDEX | +--------------------------+------------------+---------+---------+-----------+-----------+------------+ | https://10.10.3.181:2379 | 29fd839438b13490 | 3.3.12 | 20 kB | false | 2 | 8 | | https://10.10.3.182:2379 | 15e01ae39b43687d | 3.3.12 | 20 kB | false | 2 | 8 | | https://10.10.3.183:2379 | deaefeb573250ff1 | 3.3.12 | 20 kB | true | 2 | 8 | +--------------------------+------------------+---------+---------+-----------+-----------+------------+
5、flannel.yaml
ansible-playbook flannel.yaml
查看结果
$ ansible allnode -m shell -a "/usr/sbin/ip addr show flannel.1|grep -w inet" 10.10.3.183 | CHANGED | rc=0 >> inet 172.30.216.0/32 scope global flannel.1 10.10.3.184 | CHANGED | rc=0 >> inet 172.30.176.0/32 scope global flannel.1 10.10.3.182 | CHANGED | rc=0 >> inet 172.30.240.0/32 scope global flannel.1 10.10.3.181 | CHANGED | rc=0 >> inet 172.30.88.0/32 scope global flannel.1
6、kube-api.yaml
ansible-playbook kube-api.yaml
查看
$ systemctl status kube-apiserver |grep 'Active:' Active: active (running) since Tue 2019-04-16 14:25:01 CST; 55s ago
查看日志
$ journalctl -u kube-apiserver
7、kube-controller-manager.yaml
ansible-playbook kube-controller-manager.yaml
查看
$ systemctl status kube-controller-manager|grep Active
Active: active (running) since Tue 2019-04-16 14:27:19 CST; 4min 20s ag
查看日志
$ journalctl -u kube-controller-manager
8、kube-scheduler.yaml
ansible-playbook kube-scheduler.yaml
查看
$ systemctl status kube-scheduler|grep Active Active: active (running) since Tue 2019-04-16 14:55:07 CST; 15s ago
查看日志
$ journalctl -u kube-scheduler
9、docker.yaml
ansible-playbook docker.yaml
$ docker info Containers: 0 Running: 0 Paused: 0 Stopped: 0 Images: 0 Server Version: 18.09.2 Storage Driver: overlay2 Backing Filesystem: xfs Supports d_type: true Native Overlay Diff: true Logging Driver: json-file Cgroup Driver: systemd ......
10、kubelet.yaml
ansible-playbook kubelet.yaml
11、kube-proxy.yaml
ansible-playbook kube-proxy.yaml
这样就完成了简单的k8s集群搭建。这里只适合玩一玩。当初写这个的原因也是为了练习ansible。此方法不能作为生产集群。