kubadm创建k8s v1.10集群
kubadm创建k8s集群
1:服务器信息以及节点介绍
|
主机名
|
ip
|
备注
|
|---|---|---|
| k8s-master | 192.168.0.104 | master etcd keepalived |
| k8s-client1 | 192.168.0.99 | master etcd keepalived |
| k8s-client2 | 192.168.0.114 | node |
虚拟IP：192.168.0.105
2.版本说明
docker 17.03.2-ce
kubelet-1.10.0-0.x86_64
kubernetes-cni-0.6.0-0.x86_64
kubectl-1.10.0-0.x86_64
kubeadm-1.10.0-0.x86_64
3.环境要求
3.1设置主机名称
hostnamectl set-hostname k8s-master
hostnamectl set-hostname k8s-client1
hostnamectl set-hostname k8s-client2
3.2.配置主机映射
192.168.0.104 k8s-master
192.168.0.99 k8s-client1
192.168.0.114 k8s-client2
3.3k8s-master上执行ssh免密码登陆配置
ssh-keygen #一路回车即可
ssh-copy-id k8s-client1
ssh-copy-id k8s-client2
ssh-copy-id k8s-client2
3.4主机配置、停防火墙、关闭Swap、关闭Selinux、设置内核、K8S的yum源、安装依赖包、配置ntp（配置完后建议重启一次）
systemctl stop firewalld
systemctl disable firewalld
swapoff -a
sed -i 's/.swap./#&/' /etc/fstab
setenforce 0
sed -i "s/^SELINUX=enforcing/SELINUX=disabled/g" /etc/sysconfig/selinux
sed -i "s/^SELINUX=enforcing/SELINUX=disabled/g" /etc/selinux/config
sed -i "s/^SELINUX=permissive/SELINUX=disabled/g" /etc/sysconfig/selinux
sed -i "s/^SELINUX=permissive/SELINUX=disabled/g" /etc/selinux/config
modprobe br_netfilter
cat <<EOF > /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF
sysctl -p /etc/sysctl.d/k8s.conf
ls /proc/sys/net/bridge
cat <<EOF > /etc/yum.repos.d/kubernetes.repo
【kubernete】
name=Kubernetes
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/
enabled=1
gpgcheck=1
repo_gpgcheck=1
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF
yum install -y epel-release
yum install -y yum-utils device-mapper-persistent-data lvm2 net-tools conntrack-tools wget vim ntpdate libseccomp libtool-ltdl
systemctl enable ntpdate.service
echo '*/30 * * * * /usr/sbin/ntpdate time7.aliyun.com >/dev/null 2>&1' > /tmp/crontab2.tmp
crontab /tmp/crontab2.tmp
systemctl start ntpdate.service
echo "* soft nofile 65536" >> /etc/security/limits.conf
echo "* hard nofile 65536" >> /etc/security/limits.conf
echo "* soft nproc 65536" >> /etc/security/limits.conf
echo "* hard nproc 65536" >> /etc/security/limits.conf
echo "* soft memlock unlimited" >> /etc/security/limits.conf
echo "* hard memlock unlimited" >> /etc/security/limits.conf
4.安装、配置keepalived（主节点）
4.1:安装keepalived
yum install -y keepalived
systemctl enable keepalived
k8s-master的keepalived.conf
cat <<EOF > /etc/keepalived/keepalived.conf
global_defs {
router_id LVS_k8s
}
vrrp_script CheckK8sMaster {
script "curl -k https://192.168.0.105:6443"
interval 3
timeout 9
fall 2
rise 2
}
vrrp_instance VI_1 {
state MASTER
interface enp0s3
virtual_router_id 61
priority 100
advert_int 1
mcast_src_ip 192.168.0.104
nopreempt
authentication {
auth_type PASS
auth_pass sqP05dQgMSlzrxHj
}
unicast_peer {
192.168.0.99
}
virtual_ipaddress {
192.168.0.105/24
}
track_script {
CheckK8sMaster
}
}
EOF
k8s-client1的keepalived.conf
cat <<EOF > /etc/keepalived/keepalived.conf
global_defs {
router_id LVS_k8s
}
global_defs {
router_id LVS_k8s
}
vrrp_script CheckK8sMaster {
script "curl -k https://192.168.0.105:6443"
interval 3
timeout 9
fall 2
rise 2
}
vrrp_instance VI_1 {
state BACKUP
interface enp0s3
virtual_router_id 61
priority 90
advert_int 1
mcast_src_ip 192.168.0.99
nopreempt
authentication {
auth_type PASS
auth_pass sqP05dQgMSlzrxHj
}
unicast_peer {
192.168.0.104
}
virtual_ipaddress {
192.168.0.105/24
}
track_script {
CheckK8sMaster
}
}
EOF
4.2：启动keepalived
systemctl restart keepalived 可以看到VIP已经绑定到k8s-master上面了
enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
link/ether 00:50:56:b2:09:6a brd ff:ff:ff:ff:ff:ff
inet 192.168.0.104/24 brd 192.168.150.255 scope global enp0s3
valid_lft forever preferred_lft forever
inet 192.168.0.105/24 scope global secondary enp0s3
valid_lft forever preferred_lft forever
inet6 fe80::e3d1:55df:2f64:8571/64 scope link
valid_lft forever preferred_lft forever
5.创建etcd证书(k8s-master上执行即可)
设置cfssl环境
wget https://pkg.cfssl.org/R1.2/cfssl_linux-amd64
wget https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64
wget https://pkg.cfssl.org/R1.2/cfssl-certinfo_linux-amd64
chmod +x cfssl_linux-amd64
mv cfssl_linux-amd64 /usr/local/bin/cfssl
chmod +x cfssljson_linux-amd64
mv cfssljson_linux-amd64 /usr/local/bin/cfssljson
chmod +x cfssl-certinfo_linux-amd64
mv cfssl-certinfo_linux-amd64 /usr/local/bin/cfssl-certinfo
export PATH=/usr/local/bin:$PATH
创建 CA 配置文件（下面配置的IP为etc节点的IP）
mkdir /root/ssl
cd /root/ssl
cat > ca-config.json <<EOF
{
"signing": {
"default": {
"expiry": "8760h"
},
"profiles": {
"kubernetes-Soulmate": {
"usages": [
"signing",
"key encipherment",
"server auth",
"client auth"
],
"expiry": "8760h"
}
}
}
}
EOF
cat > ca-csr.json <<EOF
{
"CN": "kubernetes-Soulmate",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "shanghai",
"L": "shanghai",
"O": "k8s",
"OU": "System"
}
]
}
EOF
cfssl gencert -initca ca-csr.json | cfssljson -bare ca
cat > etcd-csr.json <<EOF
{
"CN": "etcd",
"hosts": [
"127.0.0.1",
"192.168.0.104",
"192.168.0.99"
],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "shanghai",
"L": "shanghai",
"O": "k8s",
"OU": "System"
}
]
}
EOF
cfssl gencert -ca=ca.pem \
-ca-key=ca-key.pem \
-config=ca-config.json \
-profile=kubernetes-Soulmate etcd-csr.json | cfssljson -bare etcd
k8s-master分发etcd证书到k8s-client1
mkdir -p /etc/etcd/ssl
cp etcd.pem etcd-key.pem ca.pem /etc/etcd/ssl/
ssh -n k8s-client1 "mkdir -p /etc/etcd/ssl && exit"
scp -r /etc/etcd/ssl/*.pem k8s-client1:/etc/etcd/ssl/
6.安装配置etcd (两个主节点）
安装etcd
yum install etcd -y
mkdir -p /var/lib/etcd
配置k8s-master的etcd.service
cat <<EOF >/etc/systemd/system/etcd.service
[Unit]
Description=Etcd Server
After=network.target
After=network-online.target
Wants=network-online.target
Documentation=https://github.com/coreos
[Service]
Type=notify
WorkingDirectory=/var/lib/etcd/
ExecStart=/usr/bin/etcd \
--name k8s-master \
--cert-file=/etc/etcd/ssl/etcd.pem \
--key-file=/etc/etcd/ssl/etcd-key.pem \
--peer-cert-file=/etc/etcd/ssl/etcd.pem \
--peer-key-file=/etc/etcd/ssl/etcd-key.pem \
--trusted-ca-file=/etc/etcd/ssl/ca.pem \
--peer-trusted-ca-file=/etc/etcd/ssl/ca.pem \
--initial-advertise-peer-urls https://192.168.0.104:2380 \
--listen-peer-urls https://192.168.0.104:2380 \
--listen-client-urls https://192.168.0.104:2379,http://127.0.0.1:2379 \
--advertise-client-urls https://192.168.0.104:2379 \
--initial-cluster-token etcd-cluster-0 \
--initial-cluster k8s-master=https://192.168.0.104:2380,k8s-client1=https://192.168.0.99:2380 \
--initial-cluster-state new \
--data-dir=/var/lib/etcd
Restart=on-failure
RestartSec=5
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target
EOF
配置k8s-client1的etcd.service
cat <<EOF >/etc/systemd/system/etcd.service
[Unit]
Description=Etcd Server
After=network.target
After=network-online.target
Wants=network-online.target
Documentation=https://github.com/coreos
[Service]
Type=notify
WorkingDirectory=/var/lib/etcd/
ExecStart=/usr/bin/etcd \
--name k8s-client1 \
--cert-file=/etc/etcd/ssl/etcd.pem \
--key-file=/etc/etcd/ssl/etcd-key.pem \
--peer-cert-file=/etc/etcd/ssl/etcd.pem \
--peer-key-file=/etc/etcd/ssl/etcd-key.pem \
--trusted-ca-file=/etc/etcd/ssl/ca.pem \
--peer-trusted-ca-file=/etc/etcd/ssl/ca.pem \
--initial-advertise-peer-urls https://192.168.0.99:2380 \
--listen-peer-urls https://192.168.0.99:2380 \
--listen-client-urls https://192.168.0.99:2379,http://127.0.0.1:2379 \
--advertise-client-urls https://192.168.0.99:2379 \
--initial-cluster-token etcd-cluster-0 \
--initial-cluster k8s-master=https://192.168.0.104:2380,k8s-client1=https://192.168.0.99:2380 \
--initial-cluster-state new \
--data-dir=/var/lib/etcd
Restart=on-failure
RestartSec=5
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target
EOF
添加自启动（etc集群最少2个节点才能启动，启动报错看mesages日志）
mv etcd.service /usr/lib/systemd/system/
systemctl daemon-reload
systemctl enable etcd
systemctl start etcd
systemctl status etcd
在两个etcd节点执行一下命令检查
etcdctl --endpoints=https://192.168.0.104:2379,https://192.168.0.99:2379 \
--ca-file=/etc/etcd/ssl/ca.pem \
--cert-file=/etc/etcd/ssl/etcd.pem \
--key-file=/etc/etcd/ssl/etcd-key.pem cluster-health
7.所有节点安装配置docker
安装docker（kubeadm目前支持docker最高版本是17.03.x）
yum install https://mirrors.aliyun.com/docker-ce/linux/centos/7/x86_64/stable/Packages/docker-ce-selinux-17.03.2.ce-1.el7.centos.noarch.rpm -y
yum install https://mirrors.aliyun.com/docker-ce/linux/centos/7/x86_64/stable/Packages/docker-ce-17.03.2.ce-1.el7.centos.x86_64.rpm -y
修改配置文件 vim /usr/lib/systemd/system/docker.service
ExecStart=/usr/bin/dockerd -H tcp://0.0.0.0:2375 -H unix:///var/run/docker.sock --registry-mirror=https://ms3cfraz.mirror.aliyuncs.com
启动docker
systemctl daemon-reload
systemctl restart docker
systemctl enable docker
systemctl status docker
8.安装、配置kubeadm
所有节点安装kubelet kubeadm kubectl
yum install -y kubelet kubeadm kubectl
systemctl enable kubelet
所有节点修改kubelet配置文件 /etc/systemd/system/kubelet.service.d/10-kubeadm.conf
#修改这一行
Environment="KUBELET_CGROUP_ARGS=--cgroup-driver=cgroupfs"
#添加这一行
Environment="KUBELET_EXTRA_ARGS=--v=2 --fail-swap-on=false --pod-infra-container-image=registry.cn-hangzhou.aliyuncs.com/k8sth/pause-amd64:3.0"
所有节点修改完配置文件一定要重新加载配置
systemctl daemon-reload
systemctl enable kubelet
命令补全
yum install -y bash-completion
source /usr/share/bash-completion/bash_completion
source <(kubectl completion bash)
echo "source <(kubectl completion bash)" >> ~/.bashrc
9.初始化集群
k8s-master、k8s-client1添加集群初始配置文件（集群配置文件一样）
cat <<EOF > config.yaml
apiVersion: kubeadm.k8s.io/v1alpha1
kind: MasterConfiguration
etcd:
endpoints:
- https://192.168.0.104:2379
- https://192.168.0.99:2379
caFile: /etc/etcd/ssl/ca.pem
certFile: /etc/etcd/ssl/etcd.pem
keyFile: /etc/etcd/ssl/etcd-key.pem
dataDir: /var/lib/etcd
networking:
podSubnet: 172.30.0.0/16
kubernetesVersion: 1.10.0
api:
advertiseAddress: "192.168.0.105"
token: "b99a00.a144ef80536d4344"
tokenTTL: "0s"
apiServerCertSANs:
- k8s-master
- k8s-client1
- 192.168.0.104
- 192.168.0.99
- 192.168.0.114
- 192.168.0.105
featureGates:
CoreDNS: true
imageRepository: "registry.cn-hangzhou.aliyuncs.com/k8sth"
EOF
首先k8s-master初始化集群
kubeadm init --config config.yaml
初始化失败后处理办法
kubeadm reset
初始化正常的结果如下。 kubeadm join之后的内容要保存，以后node加入集群使用
Your Kubernetes master has initialized successfully!
To start using your cluster, you need to run the following as a regular user:
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
You should now deploy a pod network to the cluster.
Run "kubectl apply -f [podnetwork].yaml" with one of the options listed at:
https://kubernetes.io/docs/concepts/cluster-administration/addons/
You can now join any number of machines by running the following on each node
as root:
kubeadm join 192.168.0.105:6443 --token b99a00.a144ef80536d4344 --discovery-token-ca-cert-hash sha256:f79b68fb698c92b9336474eb3bf184e847f967dc58a6296911892662b98b1315
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
kubeadm生成证书密码文件分发到k8s-client1
scp -r /etc/kubernetes/pki k8s-client1:/etc/kubernetes/ 部署flannel网络，只需要在k8s-master执行就行
1)下载flannel镜像并且修改tag
docker pull cnych/flannel:v0.10.0-amd64
docker tag cnych/flannel:v0.10.0-amd64 quay.io/coreos/flannel:v0.10.0-amd64
2)wget https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
#版本信息：quay.io/coreos/flannel:v0.10.0-amd64
kubectl create -f kube-flannel.yml
执行命令查看集群节点
[root@k8s-master ~]# kubectl get node
NAME STATUS ROLES AGE VERSION
k8s-master Ready master 31m v1.10.0
在k8s-client1上面分别执行初始化
kubeadm init --config config.yaml
#初始化的结果和k8s-master的结果完全一样
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
查看节点信息
[root@k8s-master ~]# kubectl get nodes
NAME STATUS ROLES AGE VERSION
k8s-master Ready master 1h v1.10.0
k8s-client1 Ready master 1h v1.10.0
让master也运行pod（默认master不运行pod）
kubectl taint nodes --all node-role.kubernetes.io/master-
10.添加k8s-client2节点到集群
在k8s-client2节点执行如下命令，即可将节点添加进集群
kubeadm join 192.168.0.105 :6443 --token b99a00.a144ef80536d4344 --discovery-token-ca-cert-hash sha256:f79b68fb698c92b9336474eb3bf184e847f967dc58a6296911892662b98b1315
[root@k8s-master ~]# kubectl get node
NAME STATUS ROLES AGE VERSION
k8s-master Ready master 45m v1.10.0
k8s-client1 Ready master 15m v1.10.0
k8s-client2 Ready <none> 13m v1.10.0
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