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03-kubernetes的二进制安装
阅读量：5819 次
发布时间：2019-06-18

本文共 28841 字，大约阅读时间需要 96 分钟。

部门内网开发环境 kubernetes 二进制安装：

kubernetes-1.13.1 + etcd-3.3.10 + flanneld-0.10集群部署

1.前提准备：

K8S服务部署安装：
172.16.14.110 k8s-master
172.16.14.112 k8s-node1
172.16.14.115 k8s-node2

# 三台主机分别修改hostname

hostnamectl set-hostname k8s-master
hostnamectl set-hostname k8s-node1
hostnamectl set-hostname k8s-node2

# 修改hosts文件

cat >>/etc/hosts<<EOF
172.16.14.110 k8s-master
172.16.14.112 k8s-node1
172.16.14.115 k8s-node2
EOF

# 关闭防火墙：

systemctl stop firewalld
systemctl disable firewalld
setenforce 0
sed -i 's/SELINUX=permissive/SELINUX=disabled/' /etc/sysconfig/selinux

# 创建/etc/sysctl.d/k8s.conf文件

net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
net.ipv4.ip_forward = 1
vm.swappiness = 0

# 执行命令使修改生效

modprobe br_netfilter
sysctl -p /etc/sysctl.d/k8s.conf

# 1.2kube-proxy开启ipvs的前置条件：

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

# ipset软件包yum install ipset。 为了便于查看ipvs的代理规则，最好安装一下管理工具ipvsadm yum yum install ipvsadm ipset sysstat conntrack libseccomp -y

# 关闭系统Swap：

swapoff -a && sysctl -w vm.swappiness=0
sed -ri '/^[^#]*swap/s@^@#@' /etc/fstab

# 先升级内核

[ ! -f /usr/bin/perl ] && yum install perl -y

# 基础系统配置

# 推荐内存2G/硬盘30G以上
# 最小化安装Ubuntu 16.04 server或者CentOS 7 Minimal
# 配置基础网络、更新源、SSH登陆等

# 在deploy节点配置免密码登陆

ssh-keygen -t rsa -b 2048 回车 回车 回车
ssh-copy-id $IPs #$IPs为所有节点地址包括自身，按照提示输入yes 和root密码

2.1 下载软件
wget https://dl.k8s.io/v1.13.1/kubernetes-server-linux-amd64.tar.gz
wget https://dl.k8s.io/v1.13.1/kubernetes-client-linux-amd64.tar.gz
wget https://github.com/etcd-io/etcd/releases/download/v3.3.10/etcd-v3.3.10-linux-amd64.tar.gz
wget https://github.com/coreos/flannel/releases/download/v0.10.0/flannel-v0.10.0-linux-amd64.tar.gz

2.2 cfssl安装

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 cfssljson_linux-amd64 cfssl-certinfo_linux-amd64
mv cfssl_linux-amd64 /usr/local/bin/cfssl
mv cfssljson_linux-amd64 /usr/local/bin/cfssljson
mv cfssl-certinfo_linux-amd64 /usr/bin/cfssl-certinfo

2.3 创建etcd证书

mkdir /k8s/etcd/{bin,cfg,ssl} -p
mkdir /k8s/kubernetes/{bin,cfg,ssl} -p
cd /k8s/etcd/ssl/

2.4 etcd ca配置

cat << EOF | tee ca-config.json
{
"signing": {
"default": {
"expiry": "87600h"
},
"profiles": {
"etcd": {
"expiry": "87600h",
"usages": [
"signing",
"key encipherment",
"server auth",
"client auth"
]
}
}
}
}
EOF

2.5 etcd ca证书

cat << EOF | tee ca-csr.json
{
"CN": "etcd CA",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"L": "Beijing",
"ST": "Beijing"
}
]
}
EOF

2.6 etcd server证书

cat << EOF | tee server-csr.json
{
"CN": "etcd",
"hosts": [
"172.16.14.110",
"172.16.14.112",
"172.16.14.115"
],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"L": "Beijing",
"ST": "Beijing"
}
]
}
EOF

2.7 生成etcd ca证书和私钥 初始化ca

cfssl gencert -initca ca-csr.json | cfssljson -bare ca
[root@elasticsearch01 ssl]# ls
ca-config.json ca-csr.json server-csr.json
[root@elasticsearch01 ssl]# cfssl gencert -initca ca-csr.json | cfssljson -bare ca
2018/12/26 16:13:54 [INFO] generating a new CA key and certificate from CSR
2018/12/26 16:13:54 [INFO] generate received request
2018/12/26 16:13:54 [INFO] received CSR
2018/12/26 16:13:54 [INFO] generating key: rsa-2048
2018/12/26 16:13:54 [INFO] encoded CSR
2018/12/26 16:13:54 [INFO] signed certificate with serial number 144752911121073185391033754516204538929473929443
[root@elasticsearch01 ssl]# ls
ca-config.json ca.csr ca-csr.json ca-key.pem ca.pem server-csr.json

2.8 生成server证书

cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=etcd server-csr.json | cfssljson -bare server
[root@elasticsearch01 ssl]# cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=etcd server-csr.json | cfssljson -bare server
2018/12/26 16:18:53 [INFO] generate received request
2018/12/26 16:18:53 [INFO] received CSR
2018/12/26 16:18:53 [INFO] generating key: rsa-2048
2018/12/26 16:18:54 [INFO] encoded CSR
2018/12/26 16:18:54 [INFO] signed certificate with serial number 388122587040599986639159163167557684970159030057
2018/12/26 16:18:54 [WARNING] This certificate lacks a "hosts" field. This makes it unsuitable for websites.
For more information see the Baseline Requirements for the Issuance and Management of Publicly-Trusted Certificates, v.1.1.6, from the CA/Browser Forum (https://cabforum.org);
specifically, section 10.2.3 ("Information Requirements").
[root@elasticsearch01 ssl]# ls
ca-config.json ca.csr ca-csr.json ca-key.pem ca.pem server.csr server-csr.json serve

2.9 etcd安装

1）解压缩
tar -xvf etcd-v3.3.10-linux-amd64.tar.gz
cd etcd-v3.3.10-linux-amd64/
cp etcd etcdctl /k8s/etcd/bin/
2）配置etcd主文件
vim cat /k8s/etcd/cfg/etcd.conf
# [Member]
ETCD_NAME="etcd01"
ETCD_DATA_DIR="/data1/etcd"
ETCD_LISTEN_PEER_URLS="https://172.16.14.110:2380"
ETCD_LISTEN_CLIENT_URLS="https://172.16.14.110:2379"
# [Clustering]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://172.16.14.110:2380"
ETCD_ADVERTISE_CLIENT_URLS="https://172.16.14.110:2379"
ETCD_INITIAL_CLUSTER="etcd01=https://172.16.14.110:2380,etcd02=https://172.16.14.112:2380,etcd03=https://172.16.14.115:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="new"

# [Security]

ETCD_CERT_FILE="/k8s/etcd/ssl/server.pem"
ETCD_KEY_FILE="/k8s/etcd/ssl/server-key.pem"
ETCD_TRUSTED_CA_FILE="/k8s/etcd/ssl/ca.pem"
ETCD_CLIENT_CERT_AUTH="true"
ETCD_PEER_CERT_FILE="/k8s/etcd/ssl/server.pem"
ETCD_PEER_KEY_FILE="/k8s/etcd/ssl/server-key.pem"
ETCD_PEER_TRUSTED_CA_FILE="/k8s/etcd/ssl/ca.pem"
ETCD_PEER_CLIENT_CERT_AUTH="true"

3）配置etcd启动文件

mkdir /data1/etcd
vim /usr/lib/systemd/system/etcd.service
[Unit]
Description=Etcd Server
After=network.target
After=network-online.target
Wants=network-online.target

[Service]

Type=notify
WorkingDirectory=/data1/etcd/
EnvironmentFile=-/k8s/etcd/cfg/etcd.conf
# set GOMAXPROCS to number of processors
ExecStart=/bin/bash -c "GOMAXPROCS=$(nproc) /k8s/etcd/bin/etcd --name=\"${ETCD_NAME}\" --data-dir=\"${ETCD_DATA_DIR}\" --listen-client-urls=\"${ETCD_LISTEN_CLIENT_URLS}\" --listen-peer-urls=\"${ETCD_LISTEN_PEER_URLS}\" --advertise-client-urls=\"${ETCD_ADVERTISE_CLIENT_URLS}\" --initial-cluster-token=\"${ETCD_INITIAL_CLUSTER_TOKEN}\" --initial-cluster=\"${ETCD_INITIAL_CLUSTER}\" --initial-cluster-state=\"${ETCD_INITIAL_CLUSTER_STATE}\" --cert-file=\"${ETCD_CERT_FILE}\" --key-file=\"${ETCD_KEY_FILE}\" --trusted-ca-file=\"${ETCD_TRUSTED_CA_FILE}\" --client-cert-auth=\"${ETCD_CLIENT_CERT_AUTH}\" --peer-cert-file=\"${ETCD_PEER_CERT_FILE}\" --peer-key-file=\"${ETCD_PEER_KEY_FILE}\" --peer-trusted-ca-file=\"${ETCD_PEER_TRUSTED_CA_FILE}\" --peer-client-cert-auth=\"${ETCD_PEER_CLIENT_CERT_AUTH}\""
Restart=on-failure
LimitNOFILE=65536

[Install]

WantedBy=multi-user.target

4）启动 注意启动前etcd02、etcd03同样配置下

使用scp 把/k8s/etcd/ssl/ 目录下的证书同步到其它节点的机器。
scp /k8s/etcd/ssl/* 172.16.14.112:/k8s/etcd/ssl/
scp /k8s/etcd/ssl/* 172.16.14.115:/k8s/etcd/ssl/

systemctl daemon-reload

systemctl enable etcd
systemctl start etcd

5）服务检查

[root@k8s-master ssl]# /k8s/etcd/bin/etcdctl --ca-file=/k8s/etcd/ssl/ca.pem --cert-file=/k8s/etcd/ssl/server.pem --key-file=/k8s/etcd/ssl/server-key.pem --endpoints="https://172.16.14.110:2379,https://172.16.14.112:2379,https://172.16.14.115:2379" cluster-health
member 68618120123ab77 is healthy: got healthy result from https://172.16.14.112:2379
member a551c491a4bd4c8d is healthy: got healthy result from https://172.16.14.110:2379
member c3fb58e1a5f59c7c is healthy: got healthy result from https://172.16.14.115:2379
cluster is healthy

3.0 生成kubernets证书与私钥

1）制作kubernetes ca证书
cd /k8s/kubernetes/ssl
cat << EOF | tee ca-config.json
{
"signing": {
"default": {
"expiry": "87600h"
},
"profiles": {
"kubernetes": {
"expiry": "87600h",
"usages": [
"signing",
"key encipherment",
"server auth",
"client auth"
]
}
}
}
}
EOF
cat << EOF | tee ca-csr.json
{
"CN": "kubernetes",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"L": "Beijing",
"ST": "Beijing",
"O": "k8s",
"OU": "System"
}
]
}
EOF
cfssl gencert -initca ca-csr.json | cfssljson -bare ca -
[root@elasticsearch01 ssl]# cfssl gencert -initca ca-csr.json | cfssljson -bare ca -
2018/12/27 09:47:08 [INFO] generating a new CA key and certificate from CSR
2018/12/27 09:47:08 [INFO] generate received request
2018/12/27 09:47:08 [INFO] received CSR
2018/12/27 09:47:08 [INFO] generating key: rsa-2048
2018/12/27 09:47:08 [INFO] encoded CSR
2018/12/27 09:47:08 [INFO] signed certificate with serial number 156611735285008649323551446985295933852737436614
[root@elasticsearch01 ssl]# ls
ca-config.json ca.csr ca-csr.json ca-key.pem ca.pem

2）制作apiserver证书

cat << EOF | tee server-csr.json
{
"CN": "etcd",
"hosts": [
"172.16.14.110",
"172.16.14.112",
"172.16.14.115"
],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"L": "Beijing",
"ST": "Beijing"
}
]
}
EOF

cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes server-csr.json | cfssljson -bare server

[root@elasticsearch01 ssl]# cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes server-csr.json | cfssljson -bare server
2018/12/27 09:51:56 [INFO] generate received request
2018/12/27 09:51:56 [INFO] received CSR
2018/12/27 09:51:56 [INFO] generating key: rsa-2048
2018/12/27 09:51:56 [INFO] encoded CSR
2018/12/27 09:51:56 [INFO] signed certificate with serial number 399376216731194654868387199081648887334508501005
2018/12/27 09:51:56 [WARNING] This certificate lacks a "hosts" field. This makes it unsuitable for
websites. For more information see the Baseline Requirements for the Issuance and Management
of Publicly-Trusted Certificates, v.1.1.6, from the CA/Browser Forum (https://cabforum.org);
specifically, section 10.2.3 ("Information Requirements").
[root@elasticsearch01 ssl]# ls
ca-config.json ca.csr ca-csr.json ca-key.pem ca.pem server.csr server-csr.json server-key.pem server.pem

3）制作kube-proxy证书

cat << EOF | tee kube-proxy-csr.json
{
"CN": "system:kube-proxy",
"hosts": [],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"L": "Beijing",
"ST": "Beijing",
"O": "k8s",
"OU": "System"
}
]
}
EOF

cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes kube-proxy-csr.json | cfssljson -bare kube-proxy

[root@elasticsearch01 ssl]# cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes kube-proxy-csr.json | cfssljson -bare kube-proxy
2018/12/27 09:52:40 [INFO] generate received request
2018/12/27 09:52:40 [INFO] received CSR
2018/12/27 09:52:40 [INFO] generating key: rsa-2048
2018/12/27 09:52:40 [INFO] encoded CSR
2018/12/27 09:52:40 [INFO] signed certificate with serial number 633932731787505365511506755558794469389165123417
2018/12/27 09:52:40 [WARNING] This certificate lacks a "hosts" field. This makes it unsuitable for
websites. For more information see the Baseline Requirements for the Issuance and Management
of Publicly-Trusted Certificates, v.1.1.6, from the CA/Browser Forum (https://cabforum.org);
specifically, section 10.2.3 ("Information Requirements").
[root@elasticsearch01 ssl]# ls
ca-config.json ca-csr.json ca.pem kube-proxy-csr.json kube-proxy.pem server-csr.json server.pem
ca.csr ca-key.pem kube-proxy.csr kube-proxy-key.pem server.csr server-key.pem

3.1 部署kubernetes server

1）解压缩文件
tar -zxvf kubernetes-server-linux-amd64.tar.gz
cd kubernetes/server/bin/
cp kube-scheduler kube-apiserver kube-controller-manager kubectl /k8s/kubernetes/bin/
2）部署kube-apiserver组件 创建TLS Bootstrapping Token
[root@elasticsearch01 bin]# head -c 16 /dev/urandom | od -An -t x | tr -d ' '
f2c50331f07be89278acdaf341ff1ecc
vim /k8s/kubernetes/cfg/token.csv
f2c50331f07be89278acdaf341ff1ecc,kubelet-bootstrap,10001,"system:kubelet-bootstrap"
创建Apiserver配置文件
vim /k8s/kubernetes/cfg/kube-apiserver
KUBE_APISERVER_OPTS="--logtostderr=true \
--v=4 \
--etcd-servers=https://172.16.14.110:2379,https://172.16.14.112:2379,https://172.16.14.115:2379 \
--bind-address=172.16.14.110 \
--secure-port=6443 \
--advertise-address=172.16.14.110 \
--allow-privileged=true \
--service-cluster-ip-range=10.254.0.0/16 \
--enable-admission-plugins=NamespaceLifecycle,LimitRanger,ServiceAccount,ResourceQuota,NodeRestriction \
--authorization-mode=RBAC,Node \
--enable-bootstrap-token-auth \
--token-auth-file=/k8s/kubernetes/cfg/token.csv \
--service-node-port-range=30000-50000 \
--tls-cert-file=/k8s/kubernetes/ssl/server.pem \
--tls-private-key-file=/k8s/kubernetes/ssl/server-key.pem \
--client-ca-file=/k8s/kubernetes/ssl/ca.pem \
--service-account-key-file=/k8s/kubernetes/ssl/ca-key.pem \
--etcd-cafile=/k8s/etcd/ssl/ca.pem \
--etcd-certfile=/k8s/etcd/ssl/server.pem \
--etcd-keyfile=/k8s/etcd/ssl/server-key.pem"

创建apiserver systemd文件

vim /usr/lib/systemd/system/kube-apiserver.service
[Unit]
Description=Kubernetes API Server
Documentation=https://github.com/kubernetes/kubernetes
[Service]
EnvironmentFile=-/k8s/kubernetes/cfg/kube-apiserver
ExecStart=/k8s/kubernetes/bin/kube-apiserver $KUBE_APISERVER_OPTS
Restart=on-failure
[Install]
WantedBy=multi-user.target

启动服务

systemctl daemon-reload
systemctl enable kube-apiserver
systemctl start kube-apiserver
[root@elasticsearch01 bin]# systemctl status kube-apiserver
● kube-apiserver.service - Kubernetes API Server
Loaded: loaded (/usr/lib/systemd/system/kube-apiserver.service; enabled; vendor preset: disabled)
Active: active (running) since Thu 2018-12-27 14:41:22 CST; 20s ago
Docs: https://github.com/kubernetes/kubernetes
Main PID: 22060 (kube-apiserver)
CGroup: /system.slice/kube-apiserver.service
└─22060 /k8s/kubernetes/bin/kube-apiserver --logtostderr=true --v=4 --etcd-servers=https://10.2.8.44:2379,https://10.2....

[root@elasticsearch01 bin]# ps -ef |grep kube-apiserver
root 22060 1 5 14:41 ? 00:00:14 /k8s/kubernetes/bin/kube-apiserver --logtostderr=true --v=4 --etcd-servers=https://10.2.8.44:2379,https://10.2.8.65:2379,https://10.2.8.34:2379 --bind-address=10.2.8.44 --secure-port=6443 --advertise-address=10.2.8.44 --allow-privileged=true --service-cluster-ip-range=10.254.0.0/16 --enable-admission-plugins=NamespaceLifecycle,LimitRanger,SecurityContextDeny,ServiceAccount,ResourceQuota,NodeRestriction --authorization-mode=RBAC,Node --enable-bootstrap-token-auth --token-auth-file=/k8s/kubernetes/cfg/token.csv --service-node-port-range=30000-50000 --tls-cert-file=/k8s/kubernetes/ssl/server.pem --tls-private-key-file=/k8s/kubernetes/ssl/server-key.pem --client-ca-file=/k8s/kubernetes/ssl/ca.pem --service-account-key-file=/k8s/kubernetes/ssl/ca-key.pem --etcd-cafile=/k8s/etcd/ssl/ca.pem --etcd-certfile=/k8s/etcd/ssl/server.pem --etcd-keyfile=/k8s/etcd/ssl/server-key.pem

[root@elasticsearch01 bin]# netstat -tulpn |grep kube-apiserve

tcp 0 0 10.2.8.44:6443 0.0.0.0:* LISTEN 22060/kube-apiserve
tcp 0 0 127.0.0.1:8080 0.0.0.0:* LISTEN 22060/kube-apiserve

3）部署kube-scheduler组件 创建kube-scheduler配置文件

vim /k8s/kubernetes/cfg/kube-scheduler
KUBE_SCHEDULER_OPTS="--logtostderr=true --v=4 --master=127.0.0.1:8080 --leader-elect"

创建kube-scheduler systemd文件

vim /usr/lib/systemd/system/kube-scheduler.service
[Unit]
Description=Kubernetes Scheduler
Documentation=https://github.com/kubernetes/kubernetes
[Service]
EnvironmentFile=-/k8s/kubernetes/cfg/kube-scheduler
ExecStart=/k8s/kubernetes/bin/kube-scheduler $KUBE_SCHEDULER_OPTS
Restart=on-failure
[Install]
WantedBy=multi-user.target

启动服务

systemctl daemon-reload
systemctl enable kube-scheduler.service
systemctl start kube-scheduler.service
[root@elasticsearch01 bin]# systemctl status kube-scheduler.service
● kube-scheduler.service - Kubernetes Scheduler
Loaded: loaded (/usr/lib/systemd/system/kube-scheduler.service; enabled; vendor preset: disabled)
Active: active (running) since Thu 2018-12-27 15:16:51 CST; 17s ago
Docs: https://github.com/kubernetes/kubernetes
Main PID: 29026 (kube-scheduler)
CGroup: /system.slice/kube-scheduler.service
└─29026 /k8s/kubernetes/bin/kube-scheduler --logtostderr=true --v=4 --master=127.0.0.1:8080 --leader-elect

4）部署kube-controller-manager组件 创建kube-controller-manager配置文件

vim /k8s/kubernetes/cfg/kube-controller-manager
KUBE_CONTROLLER_MANAGER_OPTS="--logtostderr=true \
--v=4 \
--master=127.0.0.1:8080 \
--leader-elect=true \
--address=127.0.0.1 \
--service-cluster-ip-range=10.254.0.0/16 \
--cluster-name=kubernetes \
--cluster-signing-cert-file=/k8s/kubernetes/ssl/ca.pem \
--cluster-signing-key-file=/k8s/kubernetes/ssl/ca-key.pem \
--root-ca-file=/k8s/kubernetes/ssl/ca.pem \
--service-account-private-key-file=/k8s/kubernetes/ssl/ca-key.pem"

创建kube-controller-manager systemd文件

vim /usr/lib/systemd/system/kube-controller-manager.service
[Unit]
Description=Kubernetes Controller Manager
Documentation=https://github.com/kubernetes/kubernetes
[Service]
EnvironmentFile=-/k8s/kubernetes/cfg/kube-controller-manager
ExecStart=/k8s/kubernetes/bin/kube-controller-manager $KUBE_CONTROLLER_MANAGER_OPTS
Restart=on-failure
[Install]
WantedBy=multi-user.target

启动服务

systemctl daemon-reload
systemctl enable kube-controller-manager
systemctl start kube-controller-manager
[root@elasticsearch01 bin]# systemctl status kube-controller-manager
● kube-controller-manager.service - Kubernetes Controller Manager
Loaded: loaded (/usr/lib/systemd/system/kube-controller-manager.service; enabled; vendor preset: disabled)
Active: active (running) since Thu 2018-12-27 15:19:19 CST; 11s ago
Docs: https://github.com/kubernetes/kubernetes
Main PID: 29510 (kube-controller)
CGroup: /system.slice/kube-controller-manager.service
└─29510 /k8s/kubernetes/bin/kube-controller-manager --logtostderr=true --v=4 --master=127.0.0.1:8080 --leader-elect=tru..

5） 验证kubeserver服务

设置环境变量
vim /etc/profile
PATH=/k8s/kubernetes/bin:$PATH
source /etc/profile

查看master服务状态

kubectl get cs,nodes
[root@k8s-master ssl]# kubectl get cs,nodes
NAME STATUS MESSAGE ERROR
componentstatus/scheduler Healthy ok
componentstatus/controller-manager Healthy ok
componentstatus/etcd-0 Healthy {"health":"true"}
componentstatus/etcd-1 Healthy {"health":"true"}
componentstatus/etcd-2 Healthy {"health":"true"}

4.0 Node部署

4.1 在node节点，安装好docker：
# 安装docker的yum源: 所有节点 使用阿里云的节点
sudo yum install -y yum-utils device-mapper-persistent-data lvm2
sudo yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

# 查看最新的Docker版本：

yum list docker-ce.x86_64 --showduplicates |sort -r

# 我们这里在各节点安装docker的18.06.1版本:

# 更新 yum 缓存
sudo yum makecache fast
sudo yum install -y --setopt=obsoletes=0 \
docker-ce-18.06.1.ce-3.el7

# 启动docker

sudo systemctl start docker
sudo systemctl enable docker

4.2 部署kubelet组件

1）安装二进制文件
wget https://dl.k8s.io/v1.13.1/kubernetes-node-linux-amd64.tar.gz
tar zxvf kubernetes-node-linux-amd64.tar.gz
cd kubernetes/node/bin/
cp kube-proxy kubelet kubectl /k8s/kubernetes/bin/

2）复制相关证书到node节点

scp *.pem 172.16.14.112:/k8s/kubernetes/ssl
scp *.pem 172.16.14.115:/k8s/kubernetes/ssl

3）创建kubelet bootstrap kubeconfig文件 通过脚本实现

vim /k8s/kubernetes/cfg/environment.sh
#!/bin/bash
#创建kubelet bootstrapping kubeconfig
BOOTSTRAP_TOKEN=e099f36a869d639e79d4550052eae8dd
KUBE_APISERVER="https://172.16.14.110:6443"
#设置集群参数
kubectl config set-cluster kubernetes \
--certificate-authority=/k8s/kubernetes/ssl/ca.pem \
--embed-certs=true \
--server=${KUBE_APISERVER} \
--kubeconfig=bootstrap.kubeconfig
#设置客户端认证参数
kubectl config set-credentials kubelet-bootstrap \
--token=${BOOTSTRAP_TOKEN} \
--kubeconfig=bootstrap.kubeconfig
# 设置上下文参数
kubectl config set-context default \
--cluster=kubernetes \
--user=kubelet-bootstrap \
--kubeconfig=bootstrap.kubeconfig
# 设置默认上下文
kubectl config use-context default --kubeconfig=bootstrap.kubeconfig
#----------------------
# 创建kube-proxy kubeconfig文件
kubectl config set-cluster kubernetes \
--certificate-authority=/k8s/kubernetes/ssl/ca.pem \
--embed-certs=true \
--server=${KUBE_APISERVER} \
--kubeconfig=kube-proxy.kubeconfig
kubectl config set-credentials kube-proxy \
--client-certificate=/k8s/kubernetes/ssl/kube-proxy.pem \
--client-key=/k8s/kubernetes/ssl/kube-proxy-key.pem \
--embed-certs=true \
--kubeconfig=kube-proxy.kubeconfig
kubectl config set-context default \
--cluster=kubernetes \
--user=kube-proxy \
--kubeconfig=kube-proxy.kubeconfig
kubectl config use-context default --kubeconfig=kube-proxy.kubeconfig

执行脚本

[root@elasticsearch02 cfg]# sh environment.sh
Cluster "kubernetes" set.
User "kubelet-bootstrap" set.
Context "default" created.
Switched to context "default".
Cluster "kubernetes" set.
User "kube-proxy" set.
Context "default" created.
Switched to context "default".
[root@elasticsearch02 cfg]# ls
bootstrap.kubeconfig environment.sh kube-proxy.kubeconfig

4）创建kubelet参数配置模板文件

vim /k8s/kubernetes/cfg/kubelet.config
kind: KubeletConfiguration
apiVersion: kubelet.config.k8s.io/v1beta1
address: 172.16.14.112
port: 10250
readOnlyPort: 10255
cgroupDriver: cgroupfs
clusterDNS: ["10.254.0.10"]
clusterDomain: cluster.local.
failSwapOn: false
authentication:
anonymous:
enabled: true

5）创建kubelet配置文件

vim /k8s/kubernetes/cfg/kubelet
KUBELET_OPTS="--logtostderr=true \
--v=4 \
--hostname-override=172.16.14.112 \
--kubeconfig=/k8s/kubernetes/cfg/kubelet.kubeconfig \
--bootstrap-kubeconfig=/k8s/kubernetes/cfg/bootstrap.kubeconfig \
--config=/k8s/kubernetes/cfg/kubelet.config \
--cert-dir=/k8s/kubernetes/ssl \
--pod-infra-container-image=registry.cn-hangzhou.aliyuncs.com/google-containers/pause-amd64:3.0"

6）创建kubelet systemd文件

vim /usr/lib/systemd/system/kubelet.service
[Unit]
Description=Kubernetes Kubelet
After=docker.service
Requires=docker.service
[Service]
EnvironmentFile=/k8s/kubernetes/cfg/kubelet
ExecStart=/k8s/kubernetes/bin/kubelet $KUBELET_OPTS
Restart=on-failure
KillMode=process
[Install]
WantedBy=multi-user.target

7）将kubelet-bootstrap用户绑定到系统集群角色

kubectl create clusterrolebinding kubelet-bootstrap \
--clusterrole=system:node-bootstrapper \
--user=kubelet-bootstrap
注意这个默认连接localhost:8080端口，可以在master上操作
[root@elasticsearch01 ssl]# kubectl create clusterrolebinding kubelet-bootstrap \
> --clusterrole=system:node-bootstrapper \
> --user=kubelet-bootstrap
clusterrolebinding.rbac.authorization.k8s.io/kubelet-bootstrap created

8）启动服务 systemctl daemon-reload systemctl enable kubelet systemctl start kubelet

[root@elasticsearch02 cfg]# systemctl status kubelet
● kubelet.service - Kubernetes Kubelet
Loaded: loaded (/usr/lib/systemd/system/kubelet.service; enabled; vendor preset: disabled)
Active: active (running) since Thu 2018-12-27 17:34:30 CST; 18s ago
Main PID: 24676 (kubelet)
Memory: 88.6M
CGroup: /system.slice/kubelet.service
└─24676 /k8s/kubernetes/bin/kubelet --logtostderr=true --v=4 --hostname-override=10.2.8.44 --kubeconfig=/k8s/kubernetes...

9）Master接受kubelet CSR请求 可以手动或自动 approve CSR 请求。推荐使用自动的方式，因为从 v1.8 版本开始，可以自动轮转approve csr 后生成的证书，如下是手动 approve CSR请求操作方法 查看CSR列表

[root@elasticsearch01 ssl]# kubectl get csr
NAME AGE REQUESTOR CONDITION
node-csr-ij3py9j-yi-eoa8sOHMDs7VeTQtMv0N3Efj3ByZLMdc 102s kubelet-bootstrap Pending
接受node
[root@elasticsearch01 ssl]# kubectl certificate approve node-csr-ij3py9j-yi-eoa8sOHMDs7VeTQtMv0N3Efj3ByZLMdc
certificatesigningrequest.certificates.k8s.io/node-csr-ij3py9j-yi-eoa8sOHMDs7VeTQtMv0N3Efj3ByZLMdc approved
再查看CSR
[root@elasticsearch01 ssl]# kubectl get csr
NAME AGE REQUESTOR CONDITION
node-csr-ij3py9j-yi-eoa8sOHMDs7VeTQtMv0N3Efj3ByZLMdc 5m13s kubelet-bootstrap Approved,Issued

4.3 部署kube-proxy组件

kube-proxy 运行在所有 node节点上，它监听 apiserver 中 service 和 Endpoint 的变化情况，创建路由规则来进行服务负载均衡 1）创建 kube-proxy 配置文件
vim /k8s/kubernetes/cfg/kube-proxy
KUBE_PROXY_OPTS="--logtostderr=true \
--v=4 \
--hostname-override=172.16.12.112 \
--cluster-cidr=10.254.0.0/16 \
--kubeconfig=/k8s/kubernetes/cfg/kube-proxy.kubeconfig"
2）创建kube-proxy systemd文件
vim /usr/lib/systemd/system/kube-proxy.service
[Unit]
Description=Kubernetes Proxy
After=network.target
[Service]
EnvironmentFile=-/k8s/kubernetes/cfg/kube-proxy
ExecStart=/k8s/kubernetes/bin/kube-proxy $KUBE_PROXY_OPTS
Restart=on-failure
[Install]
WantedBy=multi-user.target
3）启动服务 systemctl daemon-reload systemctl enable kube-proxy systemctl start kube-proxy
[root@elasticsearch02 cfg]# systemctl status kube-proxy
● kube-proxy.service - Kubernetes Proxy
Loaded: loaded (/usr/lib/systemd/system/kube-proxy.service; enabled; vendor preset: disabled)
Active: active (running) since Thu 2018-12-27 18:31:42 CST; 11s ago
Main PID: 5376 (kube-proxy)
Memory: 40.9M
CGroup: /system.slice/kube-proxy.service
‣ 5376 /k8s/kubernetes/bin/kube-proxy --logtostderr=true --v=4 --hostname-override=10.2.8.44 --cluster-cidr=10.254.0.0/...
4）查看集群状态
[root@elasticsearch01 cfg]# kubectl get nodes
NAME STATUS ROLES AGE VERSION
10.2.8.65 Ready <none> 9m15s v1.13.1
5）同样操作部署node 10.2.8.34并认证csr，认证后会生成kubelet-client证书
注意期间要是kubelet，kube-proxy配置错误，比如监听IP或者hostname错误导致node not found，需要删除kubelet-client证书，重启kubelet服务，重启认证csr即可
[root@elasticsearch03 kubernetes]# ls ssl
ca-key.pem kubelet-client-2018-12-27-20-13-52.pem kubelet.crt kube-proxy-key.pem server-key.pem
ca.pem kubelet-client-current.pem kubelet.key kube-proxy.pem server.pem

[root@k8s-master ssl]# kubectl get nodes

NAME STATUS ROLES AGE VERSION
172.16.14.112 Ready <none> 5h10m v1.13.1
172.16.14.115 Ready <none> 5h10m v1.13.1

5. Flanneld网络部署

5.1 etcd注册网段
/k8s/etcd/bin/etcdctl --ca-file=/k8s/etcd/ssl/ca.pem --cert-file=/k8s/etcd/ssl/server.pem --key-file=/k8s/etcd/ssl/server-key.pem --endpoints="https://172.16.14.110:2379,https://172.16.14.112:2379,https://172.16.14.115:2379" set /k8s/network/config '{ "Network": "10.254.0.0/16", "Backend": {"Type": "vxlan"}}'

5.2 flannel安装

1）解压安装
tar -xvf flannel-v0.10.0-linux-amd64.tar.gz
mv flanneld mk-docker-opts.sh /k8s/kubernetes/bin/

2）配置flanneld

vim /k8s/kubernetes/cfg/flanneld
FLANNEL_OPTIONS="--etcd-endpoints=https://172.16.14.110:2379,https://172.16.14.112:2379,https://172.16.14.115:2379 -etcd-cafile=/k8s/etcd/ssl/ca.pem -etcd-certfile=/k8s/etcd/ssl/server.pem -etcd-keyfile=/k8s/etcd/ssl/server-key.pem -etcd-prefix=/k8s/network"

创建flanneld systemd文件

vim /usr/lib/systemd/system/flanneld.service
[Unit]
Description=Flanneld overlay address etcd agent
After=network-online.target network.target
Before=docker.service
[Service]
Type=notify
EnvironmentFile=/k8s/kubernetes/cfg/flanneld
ExecStart=/k8s/kubernetes/bin/flanneld --ip-masq $FLANNEL_OPTIONS
ExecStartPost=/k8s/kubernetes/bin/mk-docker-opts.sh -k DOCKER_NETWORK_OPTIONS -d /run/flannel/subnet.env
Restart=on-failure
[Install]
WantedBy=multi-user.target

3）配置Docker启动指定子网 修改EnvironmentFile=/run/flannel/subnet.env，ExecStart=/usr/bin/dockerd $DOCKER_NETWORK_OPTIONS即可

vim /usr/lib/systemd/system/docker.service
[Unit]
Description=Docker Application Container Engine
Documentation=https://docs.docker.com
After=network-online.target firewalld.service
Wants=network-online.target
[Service]
Type=notify
EnvironmentFile=/run/flannel/subnet.env
ExecStart=/usr/bin/dockerd $DOCKER_NETWORK_OPTIONS
ExecReload=/bin/kill -s HUP $MAINPID
LimitNOFILE=infinity
LimitNPROC=infinity
LimitCORE=infinity
TimeoutStartSec=0
Delegate=yes
KillMode=process
Restart=on-failure
StartLimitBurst=3
StartLimitInterval=60s
[Install]
WantedBy=multi-user.target
4）启动服务 注意启动flannel前要关闭docker及相关的kubelet这样flannel才会覆盖docker0网桥
systemctl daemon-reload
systemctl stop docker
systemctl start flanneld
systemctl enable flanneld
systemctl start docker
systemctl restart kubelet
systemctl restart kube-proxy
5）验证服务
[root@elasticsearch02 bin]# cat /run/flannel/subnet.env
DOCKER_OPT_BIP="--bip=10.254.35.1/24"
DOCKER_OPT_IPMASQ="--ip-masq=false"
DOCKER_OPT_MTU="--mtu=1450"
DOCKER_NETWORK_OPTIONS=" --bip=10.254.35.1/24 --ip-masq=false --mtu=1450"
[root@elasticsearch02 bin]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
link/ether 52:54:00:a4:ca:ff brd ff:ff:ff:ff:ff:ff
inet 10.2.8.65/24 brd 10.2.8.255 scope global eth0
valid_lft forever preferred_lft forever
3: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN
link/ether 02:42:06:0a:ab:32 brd ff:ff:ff:ff:ff:ff
inet 10.254.35.1/24 brd 10.254.35.255 scope global docker0
valid_lft forever preferred_lft forever
4: flannel.1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1450 qdisc noqueue state UNKNOWN
link/ether 72:59:dc:2b:0a:21 brd ff:ff:ff:ff:ff:ff
inet 10.254.35.0/32 scope global flannel.1
valid_lft forever preferred_lft forever

root@k8s-master ssl]# kubectl get nodes

NAME STATUS ROLES AGE VERSION
172.16.14.112 Ready <none> 6h1m v1.13.1
172.16.14.115 Ready <none> 6h1m v1.13.1

 

转载于:https://www.cnblogs.com/hejianping/p/10917091.html

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