CentOS 7 安装Kubernetes(1)--手动部署节点

yum用起来很方便，但是为了更深入了解k8s的组成， 我还是选择了手工安装的方式进行kubernetes的安装和配置，这里分享一下。

1、安装etcd

从Github上找到最新发布的etcd，使用浏览器或者命令行下载

首先进入创建好的用户目录 /home/eos-master

（eos-master是我的用户名）

wget https://github.com/coreos/etcd/releases/download/v3.2.0/etcd-v3.2.0-linux-amd64.tar.gz

解压下载的文件

tar -xzf etcd-v3.2.0-linux-amd64.tar.gz

文件名太长，改一个文件名

mv etcd-v3.2.0-linux-amd64 etcd-3.2.0

创建软链接

ln -s /home/eos-master/etcd/etcd-3.2.0/* /usr/bin/

测试一下

etcd -version

创建系统服务

创建文件 /usr/lib/systemd/system/etcd.service

[Unit]
Description=Etcd Server
After=network.target

[Service]
Type=simple
WorkingDirectory=/home/eos-master/etcd/
EnvironmentFile=/home/eos-master/etcd/etcd.conf
ExecStart=/usr/bin/etcd $ETCD_ARGS

[Install]
WantedBy=multi-user.target

vi /home/eos-master/etcd/etcd.conf

ETCD_ARGS=”–listen-client-urls=http://192.168.199.161:2379,http://127.0.0.1:2379 –advertise-client-urls=http://192.168.199.161:2379,http://127.0.0.1:2379”

这里把ip地址加入，不然不能远程链接。

启动服务

systemctl daemon-reload

systemctl start etcd.service

systemctl enable etcd.service

用客户端链接一下试试

etcdctl cluster-health

正常返回：

member 8e9e05c52164694d is healthy: got healthy result from http://localhost:2379

cluster is healthy

2、安装kubernetes master主节点

依然去github中找到kubernetes 的release版，我下载的是1.6.6，写这篇文章的时候1.7和1.8都有了，不过是pre-relase版的，我选择了stable

之前看了一些资料，以为kube-apiserver 会包含在下载的安装包server目录中，下载下来一看傻眼了，什么都没有。找了半天发现里面有个README文件，提示说需要运行cluster/get-kube-binaries.sh 下载客户端和服务器端的文件。这里真是个小经验，像我们用windows用多了的人readme什么的都是直接忽略的，看来linux里的readme真的会有一些有用的东西。

bush cluster/get-kube-binaries.sh

下载完之后提醒问我

Extracting /home/eos-master/kubernetes/client/kubernetes-client-linux-amd64.tar.gz into /home/eos-master/kubernetes/platforms/linux/amd64

Add ‘/home/eos-master/kubernetes/client/bin’ to your PATH to use newly-installed binaries.

提示里说的是client/kubernetes-client-linux-amd64.tar.gz 其实server/kubernetes-server-linux-amd64.tar.gz 才是服务器端，继续解压

tar -xzvf kubernetes-server-linux-amd64.tar.gz

还是和之前一样做个软连接，有时候不知道自己在目录的什么位置了可以使用pwd命令查询一下当前所在目录。linux界真的能瞎起名字，pwd怎么看是密码的意思….还有什么yum 竟然是yellow dog，跟dog有什么关系….

ln -s /home/eos-master/kubernetes/server/kubernetes/server/bin/* /usr/bin/

创建服务

创建文件 /usr/lib/systemd/system/kube-apiserver.servicekube-apiserver

[Unit]
Description=Kubernetes API Server
After=etcd.service
Wants=etcd.service

[Service]
Type=notify
EnvironmentFile=/home/eos-master/kubernetes/apiserver
ExecStart=/usr/bin/kube-apiserver $KUBE_API_ARGS
Restart=on-failure
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target

然后创建配置文件

vi /home/eos-master/kubernetes/apiserver

文件内容是：

KUBE_API_ARGS=”–etcd_servers=http://127.0.0.1:2379 –insecure-bind-address=0.0.0.0 –insecure-port=8080 –service-cluster-ip-range=169.169.0.0/16 –service-node-port-range=1-65535 –admission_control=NamespaceLifecycle,LimitRanger,SecurityContextDeny,ServiceAccount,ResourceQuota –logtostderr=false –log-dir=/var/log/kubernetes –v=2”

启动服务并设置为开机启动

systemctl start kube-apiserver.service

systemctl enable kube-apiserver.service

然后同样把kube-controller-manage和kube-scheduler也都设置为服务和自动启动。

cat /usr/lib/systemd/system/kube-controller-manager.service

[Unit]
Description=Kubernetes Controller Manager
After=kube-apiserver.service
Requires=kube-apiserver.service

[Service]
Type=notify
EnvironmentFile=/home/eos-master/kubernetes/controller-manager
ExecStart=/usr/bin/kube-controller-manager $KUBE_CONTROLLER_MANAGER_ARGS
Restart=on-failure
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target

cat /home/eos-master/kubernetes/controller-manager

KUBE_CONTROLLER_MANAGER_ARGS=”–master=http://127.0.0.1:8080 –logtostderr=false –log-dir=/var/log/kubernetes –v=2”

cat <<EOF>> /usr/lib/systemd/system/kube-scheduler.service
[Unit]
Description=Kubernetes Scheduler
After=kube-apiserver.service
Requires=kube-apiserver.service

[Service]
Type=notify
EnvironmentFile=/home/eos-master/kubernetes/scheduler
ExecStart=/usr/bin/kube-scheduler $KUBE_SCHEDULER_ARGS
Restart=on-failure
Limi
4000
tNOFILE=65536

[Install]
WantedBy=multi-user.target
EOF

cat <<EOF>> /home/eos-master/kubernetes/scheduler
KUBE_SCHEDULER_ARGS="--master=http://127.0.0.1:8080 --logtostderr=false --log-dir=/var/log/kubernetes --v=2"
EOF

然后可以启动服务了

systemctl daemon-reload

systemctl start kube-controller-manager.service

systemctl enable kube-controller-manager.service

systemctl start kube-scheduler.service

systemctl enable kube-scheduler.service

3、安装Kubernetes Node 结点

1、安装docker

yum install -y docker

system启动docker服务

systemctl start docker

systemctl enable docker

2、安装Kuberlet

vi /usr/lib/systemd/system/kubelet.service

[Unit]
Description=Kubernetes Kubelet Server
After=docker.service
Requires=docker.service

[Service]
WorkingDirectory=/var/lib/kubelet
EnvironmentFile=/home/eos-master/kubernetes/kubelet
ExecStart=/usr/bin/kubelet $KUBELET_ARGS
Restart=on-failure

[Install]
WantedBy=multi-user.target

KUBELET_ARGS=”–api-servers=http://192.168.199.161:8080 –hostname-override=192.168.199.161 –logtostderr=false –log-dir=/var/log/kubernetes –v=2”

3、部署kube-proxy服务

vi /usr/lib/systemd/system/kube-proxy.service

[Unit]
Description=Kubernetes Kube-proxy Server
After=network.target
Requires=network.target

[Service]
EnvironmentFile=/home/eos-master/kubernetes/kubeproxy
ExecStart=/usr/bin/kube-proxy $KUBELET_ARGS
Restart=on-failure
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target

vi /home/eos-master/kubernetes/kubeproxy

KUBE_PROXY_ARGS=”–master=http://192.168.199.161:8080 –logtostderr=false –log-dir=/var/log/kubenetes –v=2”

kubectl get pods –namespace kube-system