kubernetes二进制安装
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2022-03-12 12:36:42
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kubernetes二进制安装
1、满足条件
- 一台或多台机器，操作系统 CentOS7.x-86_x64
- 硬件配置：2GB或更多RAM，2个CPU或更多CPU，硬盘30GB或更多
- 集群中所有机器之间网络互通
- 可以访问外网，需要拉取镜像
- 禁止swap分区
- kubernetes >= 1.9.0 内核要大于4.4
2、升级内核
#载入公钥
rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
#安装ELRepo仓库
rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-3.el7.elrepo.noarch.rpm
#载入elrepo-kernel元数据
yum --disablerepo=\* --enablerepo=elrepo-kernel repolist
#查看可用的rpm包
yum --disablerepo=\* --enablerepo=elrepo-kernel list kernel*
#安装最新版本的kernel-ml
yum --disablerepo=\* --enablerepo=elrepo-kernel install -y kernel-ml.x86_64
#查看系统上可以用的内核版本
awk -F\' '$1=="menuentry " {print i++ " : " $2}' /etc/grub2.cfg
#更改启动项
grub2-mkconfig -o /boot/grub2/grub.cfg && grub2-set-default 0
注意：这里测试环境选择的 ml ，如果正式环境需要选择lt 长期支持内核版本
3、环境准备
| 角色 | IP |
|---|---|
| k8s-master | 192.168.1.66 |
| k8s-node1 | 192.168.1.67 |
| k8s-node2 | 192.168.1.68 |
#关闭防火墙
systemctl status firewalld
systemctl stop firewalld && systemctl disable firewalld
#关闭selinux
sed -i 's/enforcing/disabled/' /etc/selinux/config
setenforce 0
#关闭swap分区
swapoff -a #临时关闭
vim /etc/fstab # 永久关闭
#设置hosts
vim /etc/hosts
192.168.1.66 k8s-master
192.168.1.67 k8s-node1
192.168.1.68 k8s-node2
时间同步
#使用 chronyd 服务，不建议使用ntp
#master:
vim /etc/chrony.conf
server ntp1.aliyun.com iburst
server ntp2.aliyun.com iburst
server ntp3.aliyun.com iburst
#node
server 192.168.1.66 iburst
[[email protected] opt]# chronyc sources
210 Number of sources = 2
MS Name/IP address Stratum Poll Reach LastRx Last sample
===============================================================================
^* 120.25.115.20 2 6 17 26 -1620us[-1017us] +/- 16ms
^- 203.107.6.88 2 6 17 26 +540us[ +540us] +/- 24ms
[[email protected] opt]# chronyc sources
210 Number of sources = 1
MS Name/IP address Stratum Poll Reach LastRx Last sample
===============================================================================
^? 192.168.1.66 0 6 0 - +0ns[ +0ns] +/- 0ns
[[email protected] opt]# chronyc sources
210 Number of sources = 1
MS Name/IP address Stratum Poll Reach LastRx Last sample
===============================================================================
^? 192.168.1.66 0 6 0 - +0ns[ +0ns] +/- 0ns
优化文件描述符
vim /etc/security/limits.conf
* hardnofile 65536
* softnofile 65536
* hardnproc 65536
* softnproc 65536
修改内核参数
cat > /etc/sysctl.d/k8s.conf << EOF
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
# 允许的最大跟踪连接条目，是在内核内存中 netfilter 可以同时处理的“任务”（连接跟踪条目）
net.netfilter.nf_conntrack_max=10485760
net.netfilter.nf_conntrack_tcp_timeout_established=300
# 哈希表大小（只读）（64位系统、8G内存默认 65536，16G翻倍，如此类推）
net.netfilter.nf_conntrack_buckets=655360
# 每个网络接口接收数据包的速率比内核处理这些包的速率快时，允许送到队列的数据包的最大数目
net.core.netdev_max_backlog=10000
# 表示socket监听(listen)的backlog上限，也就是就是socket的监听队列(accept queue)，当一个tcp连接尚未被处理或建立时(半连接状态)，会保存在这个监听队列，默认为 128，在高并发场景下偏小，优化到 32768。参考 https://imroc.io/posts/kubernetes-overflow-and-drop/
net.core.somaxconn=32768
# 没有启用syncookies的情况下，syn queue(半连接队列)大小除了受somaxconn限制外，也受这个参数的限制，默认1024，优化到8096，避免在高并发场景下丢包
net.ipv4.tcp_max_syn_backlog=8096
# 表示同一用户同时最大可以创建的 inotify 实例 (每个实例可以有很多 watch)
fs.inotify.max_user_instances=8192
# max-file 表示系统级别的能够打开的文件句柄的数量， 一般如果遇到文件句柄达到上限时，会碰到
# Too many open files 或者 Socket/File: Can’t open so many files 等错误
fs.file-max=2097152
# 表示同一用户同时可以添加的watch数目（watch一般是针对目录，决定了同时同一用户可以监控的目录数量) 默认值 8192 在容器场景下偏小，在某些情况下可能会导致 inotify watch 数量耗尽，使得创建 Pod 不成功或者 kubelet 无法启动成功，将其优化到 524288
fs.inotify.max_user_watches=524288
net.core.bpf_jit_enable=1
net.core.bpf_jit_harden=1
net.core.bpf_jit_kallsyms=1
net.core.dev_weight_tx_bias=1
net.core.rmem_max=16777216
net.core.wmem_max=16777216
net.ipv4.tcp_rmem=4096 12582912 16777216
net.ipv4.tcp_wmem=4096 12582912 16777216
net.core.rps_sock_flow_entries=8192
# 以下三个参数是 arp 缓存的 gc 阀值，相比默认值提高了，当内核维护的 arp 表过于庞大时候，可以考虑优化下，避免在某些场景下arp缓存溢出导致网络超时，参考：https://k8s.imroc.io/avoid/cases/arp-cache-overflow-causes-healthcheck-failed
# 存在于 ARP 高速缓存中的最少层数，如果少于这个数，垃圾收集器将不会运行。缺省值是 128
net.ipv4.neigh.default.gc_thresh1=2048
# 保存在 ARP 高速缓存中的最多的记录软限制。垃圾收集器在开始收集前，允许记录数超过这个数字 5 秒。缺省值是 512
net.ipv4.neigh.default.gc_thresh2=4096
# 保存在 ARP 高速缓存中的最多记录的硬限制，一旦高速缓存中的数目高于此，垃圾收集器将马上运行。缺省值是 1024
net.ipv4.neigh.default.gc_thresh3=8192
net.ipv4.tcp_max_orphans=32768
net.ipv4.tcp_max_tw_buckets=32768
vm.max_map_count=262144
kernel.threads-max=30058
net.ipv4.ip_forward=1
# 避免发生故障时没有 coredump
kernel.core_pattern=core
EOF
sysctl --system # 生效
下载依赖
#下载依赖
yum -y install gcc make libnftnl-devel libmnl-devel autoconf automake libtool bison flex libnetfilter_conntrack-devel libnetfilter_queue-devel libpcap-devel
升级iptables
#必须升级，centos7 自带的iptables 版本太低
wget https://www.netfilter.org/projects/iptables/files/iptables-1.6.2.tar.bz2
tar -jxvf iptables-1.6.2.tar.bz2
./autogen.sh
./configure
make -j4
make install
4、下载cfssl二进制包
下载 cfssl 二进制包用于签发证书，官网地址：https://pkg.cfssl.org/，下载如下文件：
将 cfssl 的几个二进制包添加到 PATH 包含的目录下：
cfssl 目录结构
TLS/etcd/server-csr.json #更改自己etcd机器ip地址
TLS/k8s/server-csr.json #更改自己k8s 集群地址，以及 lbs 地址
[[email protected] xuyao]# tree TLS
TLS
├── cfssl
├── cfssl-certinfo
├── cfssljson
├── cfssl.sh
├── etcd
│ ├── ca-config.json
│ ├── ca.csr
│ ├── ca-csr.json
│ ├── ca-key.pem
│ ├── ca.pem
│ ├── generate_etcd_cert.sh
│ ├── server.csr
│ ├── server-csr.json
│ ├── server-key.pem
│ └── server.pem
└── k8s
├── ca-config.json
├── ca.csr
├── ca-csr.json
├── ca-key.pem
├── ca.pem
├── generate_k8s_cert.sh
├── kube-proxy.csr
├── kube-proxy-csr.json
├── kube-proxy-key.pem
├── kube-proxy.pem
├── server.csr
├── server-csr.json
├── server-key.pem
└── server.pem
2 directories, 28 files
5、etcd集群
#生产etcd自签证书
#修改etcd集群配置文件ip
[[email protected] etcd]# cat server-csr.json
{
"CN": "etcd",
"hosts": [
"192.168.1.66",
"192.168.1.67",
"192.168.1.68"
],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"L": "BeiJing",
"ST": "BeiJing"
}
]
}
#执行生成自签证书脚本
[[email protected] etcd]# ./generate_etcd_cert.sh
+ cfssl gencert -initca ca-csr.json
+ cfssljson -bare ca -
2020/12/31 15:48:45 [INFO] generating a new CA key and certificate from CSR
2020/12/31 15:48:45 [INFO] generate received request
2020/12/31 15:48:45 [INFO] received CSR
2020/12/31 15:48:45 [INFO] generating key: rsa-2048
2020/12/31 15:48:45 [INFO] encoded CSR
2020/12/31 15:48:45 [INFO] signed certificate with serial number 272817761786451500858086696566593768361585469736
+ cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=www server-csr.json
+ cfssljson -bare server
2020/12/31 15:48:45 [INFO] generate received request
2020/12/31 15:48:45 [INFO] received CSR
2020/12/31 15:48:45 [INFO] generating key: rsa-2048
2020/12/31 15:48:46 [INFO] encoded CSR
2020/12/31 15:48:46 [INFO] signed certificate with serial number 101341184092860876573507489937573051863285603316
2020/12/31 15:48:46 [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").
[[email protected] etcd]# ll -rht
total 40K
-rw-r--r--. 1 root root 209 Oct 3 2019 ca-csr.json
-rw-r--r--. 1 root root 287 Oct 3 2019 ca-config.json
-rwxr-xr-x. 1 root root 178 Oct 3 2019 generate_etcd_cert.sh
-rw-r--r--. 1 root root 303 Mar 13 17:56 server-csr.json
-rw-r--r--. 1 root root 1.3K Mar 13 18:13 ca.pem
-rw-------. 1 root root 1.7K Mar 13 18:13 ca-key.pem
-rw-r--r--. 1 root root 956 Mar 13 18:13 ca.csr
-rw-r--r--. 1 root root 1.4K Mar 13 18:13 server.pem
-rw-------. 1 root root 1.7K Mar 13 18:13 server-key.pem
-rw-r--r--. 1 root root 1013 Mar 13 18:13 server.csr
#颁发etcd证书
#master & node
scp server.pem server-key.pem ca.pem /opt/etcd/ssl/
#etcd配置
[[email protected] cfg]# cat etcd.conf
#[Member]
ETCD_NAME="etcd-1"
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="https://192.168.1.66:2380"
ETCD_LISTEN_CLIENT_URLS="https://192.168.1.66:2379"
#[Clustering]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.1.66:2380"
ETCD_ADVERTISE_CLIENT_URLS="https://192.168.1.66:2379"
ETCD_INITIAL_CLUSTER="etcd-1=https://192.168.1.66:2380,etcd-2=https://192.168.1.67:2380,etcd-3=https://192.168.1.68:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="new"
#目录结构
[[email protected] opt]# tree etcd/
etcd/
├── bin
│ ├── etcd
│ └── etcdctl
├── cfg
│ └── etcd.conf
└── ssl
├── ca.pem
├── server-key.pem
└── server.pem
3 directories, 6 files
#启动etcd
systemctl enable etcd
systemctl start etcd
6、docker安装
master可以不用安装docker
wget https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo -O /etc/yum.repos.d/docker-ce.repo
yum -y install docker-ce
systemctl enable docker && systemctl start docker
配置加速器
#阿里云加速器
cat > /etc/docker/daemon.json << EOF
{
"registry-mirrors": ["https://ihwppc8g.mirror.aliyuncs.com"],
"log-driver":"json-file",
"log-opts": {"max-size":"500m", "max-file":"3"}
}
EOF
#重启docker
systemctl restart docker
#查看docker信息
docker info
7、master部署
[[email protected] k8s]# ./generate_k8s_cert.sh
[[email protected] k8s]# ll -rht
total 56K
-rwxr-xr-x 1 root root 321 Oct 3 2019 generate_k8s_cert.sh
-rw-r--r-- 1 root root 230 Oct 3 2019 kube-proxy-csr.json
-rw-r--r-- 1 root root 263 Oct 3 2019 ca-csr.json
-rw-r--r-- 1 root root 294 Oct 3 2019 ca-config.json
-rw-r--r-- 1 root root 554 Mar 16 14:52 server-csr.json
-rw-r--r-- 1 root root 1.4K Mar 16 14:54 ca.pem
-rw------- 1 root root 1.7K Mar 16 14:54 ca-key.pem
-rw-r--r-- 1 root root 1001 Mar 16 14:54 ca.csr
-rw-r--r-- 1 root root 1.6K Mar 16 14:54 server.pem
-rw------- 1 root root 1.7K Mar 16 14:54 server-key.pem
-rw-r--r-- 1 root root 1.3K Mar 16 14:54 server.csr
-rw-r--r-- 1 root root 1.4K Mar 16 14:54 kube-proxy.pem
-rw------- 1 root root 1.7K Mar 16 14:54 kube-proxy-key.pem
-rw-r--r-- 1 root root 1009 Mar 16 14:54 kube-proxy.csr
#copy到kubernetes/ssl目录下 #kube-proxoy 可以不用copy
scp ca.pem ca-key.pem server.pem server-key.pem kube-proxy.pem kube-proxy-key.pem /opt/kubernetes/ssl/
#目录结构
kubernetes
├── bin
│ ├── kube-apiserver
│ ├── kube-controller-manager
│ ├── kubectl
│ └── kube-scheduler
├── cfg
│ ├── kube-apiserver.conf
│ ├── kube-controller-manager.conf
│ ├── kube-scheduler.conf
│ └── token.csv
├── logs
│ ├── kube-apiserver.ERROR -> kube-apiserver.k8s-master.root.log.ERROR.20201231-185050.13683
│ ├── kube-apiserver.INFO -> kube-apiserver.k8s-master.root.log.INFO.20201231-185043.13683
│ ├── kube-apiserver.k8s-master.root.log.ERROR.20201231-185050.13683
│ ├── kube-apiserver.k8s-master.root.log.INFO.20201231-185043.13683
│ ├── kube-apiserver.k8s-master.root.log.WARNING.20201231-185045.13683
│ ├── kube-apiserver.WARNING -> kube-apiserver.k8s-master.root.log.WARNING.20201231-185045.13683
│ ├── kube-controller-manager.ERROR -> kube-controller-manager.k8s-master.root.log.ERROR.20201231-185128.13793
│ ├── kube-controller-manager.INFO -> kube-controller-manager.k8s-master.root.log.INFO.20201231-185113.13793
│ ├── kube-controller-manager.k8s-master.root.log.ERROR.20201231-185128.13793
│ ├── kube-controller-manager.k8s-master.root.log.INFO.20201231-185113.13793
│ ├── kube-controller-manager.k8s-master.root.log.WARNING.20201231-185117.13793
│ ├── kube-controller-manager.WARNING -> kube-controller-manager.k8s-master.root.log.WARNING.20201231-185117.13793
│ ├── kube-scheduler.INFO -> kube-scheduler.k8s-master.root.log.INFO.20201231-185137.13874
│ ├── kube-scheduler.k8s-master.root.log.INFO.20201231-185137.13874
│ ├── kube-scheduler.k8s-master.root.log.WARNING.20201231-185140.13874
│ └── kube-scheduler.WARNING -> kube-scheduler.k8s-master.root.log.WARNING.20201231-185140.13874
└── ssl
├── ca-key.pem
├── ca.pem
├── kube-proxy-key.pem
├── kube-proxy.pem
├── server-key.pem
└── server.pem
#配置文件
[[email protected] cfg]# cat kube-apiserver.conf
KUBE_APISERVER_OPTS="--logtostderr=false \
--v=2 \
--log-dir=/opt/kubernetes/logs \
--etcd-servers=http://192.168.1.66:2379,http://192.168.1.67:2379,http://192.168.1.68:2379 \
--bind-address=192.168.1.66 \
--secure-port=6443 \
--advertise-address=192.168.1.66 \
--allow-privileged=true \
--service-cluster-ip-range=10.0.0.0/24 \
--enable-admission-plugins=NamespaceLifecycle,LimitRanger,ServiceAccount,ResourceQuota,NodeRestriction \
--authorization-mode=RBAC,Node \
--enable-bootstrap-token-auth=true \
--token-auth-file=/opt/kubernetes/cfg/token.csv \
--service-node-port-range=30000-32767 \
--kubelet-client-certificate=/opt/kubernetes/ssl/server.pem \
--kubelet-client-key=/opt/kubernetes/ssl/server-key.pem \
--tls-cert-file=/opt/kubernetes/ssl/server.pem \
--tls-private-key-file=/opt/kubernetes/ssl/server-key.pem \
--client-ca-file=/opt/kubernetes/ssl/ca.pem \
--service-account-key-file=/opt/kubernetes/ssl/ca-key.pem \
--etcd-cafile=/opt/etcd/ssl/ca.pem \
--etcd-certfile=/opt/etcd/ssl/server.pem \
--etcd-keyfile=/opt/etcd/ssl/server-key.pem \
--audit-log-maxage=30 \
--audit-log-maxbackup=3 \
--audit-log-maxsize=100 \
--audit-log-path=/opt/kubernetes/logs/k8s-audit.log"
[[email protected] cfg]# cat kube-controller-manager.conf
KUBE_CONTROLLER_MANAGER_OPTS="--logtostderr=false \
--v=2 \
--log-dir=/opt/kubernetes/logs \
--leader-elect=true \
--master=127.0.0.1:8080 \
--address=127.0.0.1 \
--allocate-node-cidrs=true \
--cluster-cidr=10.244.0.0/16 \
--service-cluster-ip-range=10.0.0.0/24 \
--cluster-signing-cert-file=/opt/kubernetes/ssl/ca.pem \
--cluster-signing-key-file=/opt/kubernetes/ssl/ca-key.pem \
--root-ca-file=/opt/kubernetes/ssl/ca.pem \
--service-account-private-key-file=/opt/kubernetes/ssl/ca-key.pem \
--experimental-cluster-signing-duration=87600h0m0s"
[[email protected] cfg]# cat kube-scheduler.conf
KUBE_SCHEDULER_OPTS="--logtostderr=false \
--v=2 \
--log-dir=/opt/kubernetes/logs \
--leader-elect \
--master=127.0.0.1:8080 \
--address=127.0.0.1"
[[email protected] opt]# 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 2020-12-31 18:50:43 CST; 3 days ago
Docs: https://github.com/kubernetes/kubernetes
Main PID: 13683 (kube-apiserver)
CGroup: /system.slice/kube-apiserver.service
└─13683 /opt/kubernetes/bin/kube-apiserver --logtostderr=false --v=2 --log-dir=/opt/kubernetes/logs --etcd-servers=https://192.168....
Dec 31 18:50:43 k8s-master systemd[1]: Started Kubernetes API Server.
Dec 31 18:50:50 k8s-master kube-apiserver[13683]: E1231 18:50:50.037606 13683 controller.go:152] Unable to remove old endpoints from ...rorMsg:
Hint: Some lines were ellipsized, use -l to show in full.
[[email protected] opt]# 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 2020-12-31 18:51:13 CST; 3 days ago
Docs: https://github.com/kubernetes/kubernetes
Main PID: 13793 (kube-controller)
CGroup: /system.slice/kube-controller-manager.service
└─13793 /opt/kubernetes/bin/kube-controller-manager --logtostderr=false --v=2 --log-dir=/opt/kubernetes/logs --leader-elect=true --...
Dec 31 18:51:13 k8s-master systemd[1]: Started Kubernetes Controller Manager.
Dec 31 18:51:13 k8s-master kube-controller-manager[13793]: Flag --address has been deprecated, see --bind-address instead.
Dec 31 18:51:13 k8s-master kube-controller-manager[13793]: Flag --experimental-cluster-signing-duration has been deprecated, use --clust...ration
Dec 31 18:51:28 k8s-master kube-controller-manager[13793]: E1231 18:51:28.719414 13793 core.go:230] failed to start cloud node lifecyc...ovided
Dec 31 18:51:28 k8s-master kube-controller-manager[13793]: E1231 18:51:28.723549 13793 core.go:90] Failed to start service controller:...l fail
Hint: Some lines were ellipsized, use -l to show in full.
[[email protected] opt]# systemctl status kube-scheduler
● kube-scheduler.service - Kubernetes Scheduler
Loaded: loaded (/usr/lib/systemd/system/kube-scheduler.service; enabled; vendor preset: disabled)
Active: active (running) since Thu 2020-12-31 18:51:37 CST; 3 days ago
Docs: https://github.com/kubernetes/kubernetes
Main PID: 13874 (kube-scheduler)
CGroup: /system.slice/kube-scheduler.service
└─13874 /opt/kubernetes/bin/kube-scheduler --logtostderr=false --v=2 --log-dir=/opt/kubernetes/logs --leader-elect --master=127.0.0...
Dec 31 18:51:37 k8s-master systemd[1]: Started Kubernetes Scheduler.
Dec 31 18:51:37 k8s-master kube-scheduler[13874]: I1231 18:51:37.793391 13874 registry.go:173] Registering SelectorSpread plugin
Dec 31 18:51:37 k8s-master kube-scheduler[13874]: I1231 18:51:37.793563 13874 registry.go:173] Registering SelectorSpread plugin
[[email protected] opt]#
#复制kubectl
scp /opt/kubernetes/bin/kubectl /usr/bin
#查看cs
[[email protected] opt]# kubectl get cs
Warning: v1 ComponentStatus is deprecated in v1.19+
NAME STATUS MESSAGE ERROR
controller-manager Healthy ok
scheduler Healthy ok
etcd-1 Healthy {"health":"true"}
etcd-0 Healthy {"health":"true"}
etcd-2 Healthy {"health":"true"}
启用TLS Bootstrapping
TLS Bootstrapping 机制的作用就是让 Node 中的 kubelet 启动时能自动向 kube-apiserver 发起申请为 kubelet 颁发证书，它在启动 kube-apiserver 是通过 –enable-bootstrap-token-auth=true 选项来启用，在上面已经启用了。然后可通过 –token-auth-file 来指定一个认证配置，也就是上面添加的 /opt/kubernetes/cfg/token.csv 文件，其内容如下：
[[email protected] cfg]# cat /opt/kubernetes/cfg/token.csv
d8449d7d601eae4227620a298c693308,kubelet-bootstrap,10001,"system:node-bootstrapper"
其中各列的含义如下:
-
d8449d7d601eae4227620a298c693308：认证 Token，该 Token 可通过head -c 16 /dev/urandom | od -An -t x | tr -d ' '自行生成，但 API Server 中配置的 Token 必须要与 Node 节点的/opt/kubernetes/conf/bootstrap.kubeconfig配置里一致； -
kubelet-bootstrap：用户； -
10001：UID； -
system:node-bootstrapper：组；
此时我们虽然已经启用了 TLS Bootstrapping，但 kubelet-bootstrap 目前还是没有任何权限的，此时我们需要给它手动授权一下，将它绑定到内置的集群角色 system:node-bootstrapper 即可，操作如下：
kubectl create clusterrolebinding kubelet-bootstrap \
--clusterrole=system:node-bootstrapper \
--user=kubelet-bootstrap
4、node部署
[[email protected] opt]# tree kubernetes/
kubernetes/
├── bin
│?? ├── kubectl
│?? ├── kubelet
│?? └── kube-proxy
├── cfg
│?? ├── bootstrap.kubeconfig
│?? ├── kubelet.conf
│?? ├── kubelet-config.yml
│?? ├── kubelet.kubeconfig
│?? ├── kube-proxy.conf
│?? ├── kube-proxy-config.yml
│?? └── kube-proxy.kubeconfig
├── logs
└── ssl
4 directories, 10 files
Kubernetes Node节点上除了要部署Docker，还需要的Kubernetes组件有kubelet和kube-proxy，这两个二进制程序在部署Kubernetes Master节点时解压的kubernetes-server-linux-amd64.tar.gz中已经存在，在解压后的kubernetes/server/bin/目录下，将它们拷贝到两个Kubernetes Node节点的Kubernetes安装目录：
[[email protected] bin]# scp kubectl kubelet kube-proxy /opt/kubernetes/bin/
[[email protected] bin]#
[[email protected] bin]# ./kubelet --version
Kubernetes v1.19.6
由于
Kubernetes Node端的kubelet和kube-proxy是要与API Server进行通信的，所以需要将之前生成的ca.pem、kube-proxy.pem和kube-proxy-key.pem拷贝到kubernetes Node端，如下：
[[email protected] ssl]# scp ca.pem kube-proxy*.pem [email protected]:/opt/kubernetes/ssl/
[email protected]'s password:
ca.pem 100% 1359 81.6KB/s 00:00
kube-proxy-key.pem 100% 1679 1.4MB/s 00:00
kube-proxy.pem 100% 1403 1.2MB/s 00:00
创建
kubelet用于TLS Bootstrapping的认证配置文件：
[[email protected] cfg]# cat bootstrap.kubeconfig
apiVersion: v1
clusters:
- cluster:
certificate-authority: /opt/kubernetes/ssl/ca.pem
server: http://192.168.1.66:6443
name: kubernetes
contexts:
- context:
cluster: kubernetes
user: kubelet-bootstrap
name: default
current-context: default
kind: Config
preferences: {}
users:
- name: kubelet-bootstrap
user:
token: d8449d7d601eae4227620a298c693308
创建
kubelet的资源型配置的YAML文件
[[email protected] cfg]# cat kubelet-config.yml
kind: KubeletConfiguration
apiVersion: kubelet.config.k8s.io/v1beta1
address: 0.0.0.0
port: 10250
readOnlyPort: 10255
cgroupDriver: cgroupfs
clusterDNS:
- 10.0.0.2
clusterDomain: cluster.local
failSwapOn: false
authentication:
anonymous:
enabled: false
webhook:
cacheTTL: 2m0s
enabled: true
x509:
clientCAFile: /opt/kubernetes/ssl/ca.pem
authorization:
mode: Webhook
webhook:
cacheAuthorizedTTL: 5m0s
cacheUnauthorizedTTL: 30s
evictionHard:
imagefs.available: 15%
memory.available: 100Mi
nodefs.available: 10%
nodefs.inodesFree: 5%
maxOpenFiles: 1000000
maxPods: 110
创建
kubelet的启动配置文件:
注意这里的 --hostname-override 在不同的 Kubernetes Node 上是不同的。
[[email protected] cfg]# cat kubelet.conf
KUBELET_OPTS="--logtostderr=false \
--v=2 \
--log-dir=/opt/kubernetes/logs \
--hostname-override=node1 \
--network-plugin=cni \
--kubeconfig=/opt/kubernetes/cfg/kubelet.kubeconfig \
--bootstrap-kubeconfig=/opt/kubernetes/cfg/bootstrap.kubeconfig \
--config=/opt/kubernetes/cfg/kubelet-config.yml \
--cert-dir=/opt/kubernetes/ssl \
--pod-infra-container-image=registry.cn-shenzhen.aliyuncs.com/zze/pause:3.2"
创建
kube-proxy与kube-apiserver通信的认证配置文件：
[[email protected] cfg]# cat kube-proxy.kubeconfig
apiVersion: v1
clusters:
- cluster:
certificate-authority: /opt/kubernetes/ssl/ca.pem
server: http://192.168.1.66:6443
name: kubernetes
contexts:
- context:
cluster: kubernetes
user: kube-proxy
name: default
current-context: default
kind: Config
preferences: {}
users:
- name: kube-proxy
user:
client-certificate: /opt/kubernetes/ssl/kube-proxy.pem
client-key: /opt/kubernetes/ssl/kube-proxy-key.pem
创建
kube-proxy的资源型配置的 YAML 文件：
注意这里的 hostnameOverride 在不同的 Kubernetes Node 上是不同的。
[[email protected] cfg]# cat kube-proxy-config.yml
kind: KubeProxyConfiguration
apiVersion: kubeproxy.config.k8s.io/v1alpha1
address: 0.0.0.0
metricsBindAddress: 0.0.0.0:10249
clientConnection:
kubeconfig: /opt/kubernetes/cfg/kube-proxy.kubeconfig
hostnameOverride: node1
clusterCIDR: 10.0.0.0/24
mode: ipvs
ipvs:
scheduler: "rr"
iptables:
masqueradeAll: true
创建
kube-proxy的启动配置文件:
[[email protected] cfg]# cat kube-proxy.conf
KUBE_PROXY_OPTS="--logtostderr=false \
--v=2 \
--log-dir=/opt/kubernetes/logs \
--config=/opt/kubernetes/cfg/kube-proxy-config.yml"
创建kubelet的 Systemd service文件：
$ cat /usr/lib/systemd/system/kubelet.service
[Unit]
Description=Kubernetes Kubelet
After=docker.service
Before=docker.service
[Service]
EnvironmentFile=/opt/kubernetes/cfg/kubelet.conf
ExecStart=/opt/kubernetes/bin/kubelet $KUBELET_OPTS
Restart=on-failure
LimitNOFILE=65535
[Install]
WantedBy=multi-user.target
创建
kube-proxy的ystemd service文件：
cat /usr/lib/systemd/system/kube-proxy.service
[Unit]
Description=Kubernetes Proxy
After=network.target
[Service]
EnvironmentFile=/opt/kubernetes/cfg/kube-proxy.conf
ExecStart=/opt/kubernetes/bin/kube-proxy $KUBE_PROXY_OPTS
Restart=on-failure
LimitNOFILE=65535
[Install]
WantedBy=multi-user.target
启动
kubelet并设置开机自启：
$ systemctl start kubelet.service
$ systemctl enable kubelet.service
后续继续更新
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