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k8s 集群安装（自用）

由 早过忘川 提交于 2019-12-05 23:52:38

k8s 集群安装

1）初始化：

每台机器上均需要执行

yum install -y conntrack ntpdate ntp ipvsadm ipset jq iptables curl sysstat libseccomp wget vim net-tools git

# 关闭防火墙 安装，清空 iptables
systemctl stop firwalld && systemctl disable firewalld
yum -y install iptables-services && systemctl start iptables && systemctl enable ipstables && iptables -F && service iptables save

# 关闭虚拟内存
swapoff -a && sed -i '/ swap / s/^\(.*\)$/#\1/g' /etc/fstab

# 关闭 Selinux
setenforce 0 && sed -i 's/^SELINUX=.*/SELINUX=disabled/' /etc/selinux/config


# 调整内核参数，对于k8s
cat > k8s.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
vm.overcommit_memory=1
vm.panic_on_oom=0
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 k8s.conf /etc/sysctl.d/k8s.conf
sysctl -p /etc/sysctl.d/k8s.conf


# 设置 rsyslogd 和 systemd journald
# 持久化保存日志的目录
mkdir /var/log/journal
mkdir /etc/systemd/journald.conf.d
cat > /etc/systemd/journald.conf.d/99-prophet.conf <<EOF
[Journal]
# 持久化保存到磁盘
Storage=persistent

# 压缩历史日志
Compress=yes

SyncIntervalSec=5m
RateLimitInterval=30s
RateLimitBurst=1000

# 最大占用空间10g
SystemMaxUse=10G

# 单个日志文件最大 200m
SystemMaxFileSize=200m

# 日志保存时间2周
MaxRetentionSec=2week

# 不将日志转发到 syslog
ForwardToSyslog=no
EOF

systemctl restart systemd-journald

升级内核为 4.44

rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-3.el7.elrepo.noarch.rpm
# 安装完成后检查 /boot/grub2/grub.cfg 中对应内核 menuentry 中是否包含 initrd16 配置，如果没有，再装一次！
yum --enablerepo=elrepo-kernel install -y kernel-lt
#  设置开机从新内核启动
grub2-set-default "CentOS linux (4.4.182-1.el7.elrepo.x86_64) 7 (Core)"

kube-proxy开启ipvs的前置条件

modprobe br_netfilter
cat > /etc/sysconfig/modules/ipvs.module <<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

安装 Docker

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

mkdir /etc/docker

cat > /etc/docker/daemon.json <<EOF
{
    "exec-opts": ["native.cgroupdriver=systemd"],
    "log-deriver": "json-file",
    "log-opts": {
        "max-size": "100m"
    }
}
EOF

mkdir -p /etc/systemd/system/docker.service.d
systemctl daemon-reload && systemctl restart docker && systemctl enable docker

安装 Kubeadm （主从配置）

cat <<EOF > /etc/yum.repos.d/kubernetes.repo
[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://mirros.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

初始化主节点

# 需要拉取kubernetes的docker镜像
# 生成kubeadm配置文件，修改配置文件里的images下载源、是否允许Master允许业务Pod、网络配置信息
kubeadm config print init-defaults > kubeadm.conf

vi kubeadm.conf
//修改默认kubeadm初始化参数如下
imageRepository: registry.cn-hangzhou.aliyuncs.com/google_containers
kubernetesVersion: v1.15.1
nodeRegistration:
  taints:
  - effect: PreferNoSchedule
    key: node-role.kubernetes.io/master
localAPIEndpoint:
  advertiseAddress: 10.0.135.30
networking:
  dnsDomain: cluster.local
  podSubnet: 192.168.0.0/16
  serviceSubnet: 172.18.0.0/16


# 使用自定义配置拉取 images
kubeadm config images pull --config kubeadm.conf


# 修改pull images的tag
# 从国内镜像网站下载的Images需要re tag到k8s.gcr.io
docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/kube-scheduler:v1.15.1 k8s.gcr.io/kube-scheduler:v1.15.1
docker rmi registry.cn-hangzhou.aliyuncs.com/google_containers/kube-scheduler:v1.15.1

docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/kube-proxy:v1.15.1 k8s.gcr.io/kube-proxy:v1.15.1
docker rmi registry.cn-hangzhou.aliyuncs.com/google_containers/kube-proxy:v1.15.1

docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/kube-controller-manager:v1.15.1 k8s.gcr.io/kube-controller-manager:v1.15.1
docker rmi registry.cn-hangzhou.aliyuncs.com/google_containers/kube-controller-manager:v1.15.1

docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/kube-apiserver:v1.15.1 k8s.gcr.io/kube-apiserver:v1.15.1
docker rmi registry.cn-hangzhou.aliyuncs.com/google_containers/kube-apiserver:v1.15.1

docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/coredns:1.3.1 k8s.gcr.io/coredns:1.3.1
docker rmi registry.cn-hangzhou.aliyuncs.com/google_containers/coredns:1.3.1

docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/etcd:3.3.10 k8s.gcr.io/etcd:3.3.10
docker rmi registry.cn-hangzhou.aliyuncs.com/google_containers/etcd:3.3.10

docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/pause:3.1 k8s.gcr.io/pause:3.1
docker rmi registry.cn-hangzhou.aliyuncs.com/google_containers/pause:3.1


# 确认 re tag 成功
docker images

## 以上全部节点都需要执行

# 部署 master 节点
# 初始化 kubeadm
kubeadm init --config /root/kubeadm.conf


# 部署网络
wget https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml

kubectl create -f kube-flannel.yml

kubectl get pod -n kube-system

构建harbor私有仓库

# 包括harbor节点，所以节点都需要执行
cat > /etc/docker/daemon.json <<EOF
{
    "exec-opts": ["native.cgroupdriver=systemd"],
    "log-deriver": "json-file",
    "log-opts": {
        "max-size": "100m"
    },
    "insecure-registries": ["https://hub.ko.com"] 
}
EOF
systemctl restart docker


# 以下内容只需要在 harber执行
# 下载docker-commpose
curl -L "https://github.com/docker/compose/releases/download/1.22.0/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose
# 为docker-commpose添加权限
chmod +x /usr/local/bin/docker-commpose
# 验证查看docker-compose版本
docker-commpose --version

# 安装 harbor
wget https://storage.googleapis.com/harbor-releases/harbor-offline-installer-v1.5.3.tgz
tar -xf     harbor-offline-installer-v1.5.3.tgz
mv harbor /opt/
cd /opt/harbor

vim harbor.cfg
hostname = 192.168.1.100 # 这里设置为主机ip或者是dns
harbor_admin_password = 123456 # 修改admin用户的密码

#创建 https 证书以及配置
openssl genrsa -des3 -out server.key 2048
openssl req -new -key server.key -out server.csr
cp server.key server.key.org
openssl rsa -in server.key.org -out server.key
openssl x509 -req -days 365 -in server.csr -signkey server.key -out server.crt
mkdir /data/cert -p
cp * /data/cert
chmod +x /data/cert/*

./prepare  # 配置harbor
./install.sh  # 安装 harbor

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标签
k8s
Kubernetes
Docker
yum
systemd
etc
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