使用kubeadmin 配置 k8s 集羣
標籤(空格分隔): kubernetes系列
一:系統初始化
- 二:kubernetes 安裝
一:系統初始化
1.1 系統主機名
172.17.100.1 node01.flyfish
172.17.100.2 node02.flyfish
172.17.100.3 node03.flyfish
172.17.100.4 node04.flyfish
172.17.100.5 node05.flyfish
172.17.100.6 node06.flyfish
1.2 關閉firewalld 清空iptables 與 selinux 規則
系統節點全部執行:
systemctl stop firewalld && systemctl disable firewalld && yum -y install iptables-services && systemctl start iptables && systemctl enable iptables && iptables -F && service iptables save
關閉 SELINUX
swapoff -a && sed -i '/ swap / s/^\(.*\)$/#\1/g' /etc/fstab
setenforce 0 && sed -i 's/^SELINUX=.*/SELINUX=disabled/' /etc/selinux/config
1.3 安裝 依賴包
全部節點安裝
yum install -y conntrack ntpdate ntp ipvsadm ipset jq iptables curl sysstat libseccomp wget vim net-tools git
1.4 升級調整內核參數,對於 K8S
所有節點都執行
cat > kubernetes.conf <<EOF
net.bridge.bridge-nf-call-iptables=1
net.bridge.bridge-nf-call-ip6tables=1
net.ipv4.ip_forward=1
net.ipv4.tcp_tw_recycle=0
vm.swappiness=0 # 禁止使用 swap 空間,只有當系統 OOM 時才允許使用它 vm.overcommit_memory=1 # 不檢查物理內存是否夠用
vm.panic_on_oom=0 # 開啓 OOM
fs.inotify.max_user_instances=8192
fs.inotify.max_user_watches=1048576
fs.file-max=52706963
fs.nr_open=52706963
net.ipv6.conf.all.disable_ipv6=1
net.netfilter.nf_conntrack_max=2310720
EOF
cp kubernetes.conf /etc/sysctl.d/kubernetes.conf
sysctl -p /etc/sysctl.d/kubernetes.conf
1.5 調整系統時區
# 設置系統時區爲 中國/上海 timedatectl set-timezone Asia/Shanghai
# 將當前的 UTC 時間寫入硬件時鐘 timedatectl set-local-rtc 0
# 重啓依賴於系統時間的服務
systemctl restart rsyslog && systemctl restart crond
###1.6 關閉系統不需要服務
systemctl stop postfix && systemctl disable postfix
###1.7 設置 rsyslogd 和 systemd journald
mkdir /var/log/journal # 持久化保存日誌的目錄
mkdir /etc/systemd/journald.conf.d
cat > /etc/systemd/journald.conf.d/99-prophet.conf <<EOF
[Journal]
# 持久化保存到磁盤
Storage=persistent
# 壓縮歷史日誌
Compress=yes
SyncIntervalSec=5m
RateLimitInterval=30s
RateLimitBurst=1000
# 最大佔用空間 10G
SystemMaxUse=10G
# 單日誌文件最大 200M
SystemMaxFileSize=200M
# 日誌保存時間 2 周
MaxRetentionSec=2week
# 不將日誌轉發到 syslog
ForwardToSyslog=no
EOF
systemctl restart systemd-journald
1.7 升級系統內核爲 4.44
CentOS 7.x 系統自帶的 3.10.x 內核存在一些 Bugs,導致運行的 Docker、Kubernetes 不穩定,例如: rpm -Uvh
http://www.elrepo.org/elrepo-release-7.0-3.el7.elrepo.noarch.rpm
rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-3.el7.elrepo.noarch.rpm
# 安裝完成後檢查 /boot/grub2/grub.cfg 中對應內核 menuentry 中是否包含 initrd16 配置,如果沒有,再安裝 一次!
yum --enablerepo=elrepo-kernel install -y kernel-lt
# 設置開機從新內核啓動
grub2-set-default "CentOS Linux (4.4.182-1.el7.elrepo.x86_64) 7 (Core)"
reboot
# 重啓後安裝內核源文件
yum --enablerepo=elrepo-kernel install kernel-lt-devel-$(uname -r) kernel-lt-headers-$(uname -r)
1.8 kube-proxy開啓ipvs的前置條件
modprobe br_netfilter
cat > /etc/sysconfig/modules/ipvs.modules <<EOF
#!/bin/bash
modprobe -- ip_vs
modprobe -- ip_vs_rr
modprobe -- ip_vs_wrr
modprobe -- ip_vs_sh
modprobe -- nf_conntrack_ipv4
EOF
chmod 755 /etc/sysconfig/modules/ipvs.modules
bash /etc/sysconfig/modules/ipvs.modules
lsmod | grep -e ip_vs -e nf_conntrack_ipv4
二: 開始安裝k8s 集羣
2.1 安裝docker
機器節點都執行:
yum install -y yum-utils device-mapper-persistent-data lvm2
yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
yum update -y && yum install -y docker-ce-18.09.9-3.el7
重啓機器: reboot
查看內核版本: uname -r
在加載: grub2-set-default "CentOS Linux (4.4.182-1.el7.elrepo.x86_64) 7 (Core)" && reboot
如果還不行
就改 文件 : vim /etc/grub2.cfg 註釋掉 3.10 的 內核
保證 內核的版本 爲 4.4
service docker start
chkconfig docker on
## 創建 /etc/docker 目錄
mkdir /etc/docker
# 配置 daemon.
cat > /etc/docker/daemon.json <<EOF
{ "exec-opts": ["native.cgroupdriver=systemd"], "log-driver": "json-file", "log-opts": { "max-size": "100m" } }
EOF
mkdir -p /etc/systemd/system/docker.service.d
# 重啓docker服務
systemctl daemon-reload && systemctl restart docker && systemctl enable docker
2.2 安裝 Kubeadm (主從配置)
cat >> /etc/yum.repos.d/kubernetes.repo << EOF
[kubernetes]
name=Kubernetes
baseurl=http://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=0
repo_gpgcheck=0
gpgkey=http://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg
http://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF
yum -y install kubeadm-1.15.1 kubectl-1.15.1 kubelet-1.15.1
systemctl enable kubelet.service
節點全部配置:
上傳導入文件
kubeadm-basic.images.tar.gz
tar -zxvf kubeadm-basic.images.tar.gz
### 寫一個導入腳本
vim load-image.sh
---
#!/bin/bash
ls /root/kubeadm-basic.images > /tmp/image-list.txt
cd /root/kubeadm-basic.images
for i in $(cat /tmp/image-list.txt)
do
docker load -i $i
done
---
chmod +x load-image.sh
./load-image.sh
scp kubeadm-basic.images.tar.gz load-image.sh [email protected]:/root
scp kubeadm-basic.images.tar.gz load-image.sh [email protected]:/root
login : 172.17.100.2
tar -zxvf kubeadm-basic.images.tar.gz
./load-image.sh
login: 172.17.100.3
tar -zxvf kubeadm-basic.images.tar.gz
./load-image.sh
2.3 初始化主節點
kubeadm config print init-defaults > kubeadm-config.yaml
vim kubeadm-config.yaml
---
advertiseAddress: 172.17.100.1 (改爲主節點IP地址)
增加
podSubnet: "10.244.0.0/16"
---
---
apiVersion: kubeproxy.config.k8s.io/v1alpha1
kind: KubeProxyConfiguration
featureGates:
SupportIPVSProxyMode: true
mode: "ipvs"
---
kubeadm init --config=kubeadm-config.yaml --experimental-upload-certs | tee kubeadm-init.log
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
kubectl get node
###2.4 準備flannel 的 網絡
cd /etc/kubernetes/manifests/
vim kube-controller-manager.yaml
---
增加:
- --allocate-node-cidrs=true
- --cluster-cidr=10.244.0.0/16
---
mkdir -p k8s-install/{core,plugin}
mv kubeadm-init.log k8s-install/core
mv kubeadm-config.yaml k8s-install/core
cd k8s-install/plugin
wget https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
vim kube-flannel.yml
-----
因爲quay.io/coreos/flannel:v0.11.0-amd64 這個 quay.io 這個 在國外需要***,才能下載到flannel:v0.11.0-amd64 資源 , 所以要改掉 改成:quay-mirror.qiniu.com
-----
kubectl create -f kube-flannel.yml
kubectl get pod -n kube-system
2.5 將其它節點加入到這個集羣裏面
node01.flyfish
cd /root/k8s-install/
cat kubeadm-init.log
---
到最後一行有加入命令
kubeadm join 192.168.100.11:6443 --token abcdef.0123456789abcdef \
--discovery-token-ca-cert-hash sha256:1e93d61321b0fee1993134f1379ccb73cb9bd79f5cb4af965be1abb77dae295b
---
node02.flyfish:
kubeadm join 192.168.100.11:6443 --token abcdef.0123456789abcdef \
--discovery-token-ca-cert-hash sha256:1e93d61321b0fee1993134f1379ccb73cb9bd79f5cb4af965be1abb77dae295b
node03.flyfish:
kubeadm join 192.168.100.11:6443 --token abcdef.0123456789abcdef \
--discovery-token-ca-cert-hash sha256:1e93d61321b0fee1993134f1379ccb73cb9bd79f5cb4af965be1abb77dae295b
node01.flyfish:
kubectl get node
kubectl get pods -n kube-system
至此k8s 三節點集羣完成安裝: