1、查看Ubuntu系统版本
w@node1:~$ lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 18.04.6 LTS Release: 18.04 Codename: bionic
2、设置主机名
vim /etc/hostname
w@node1:~$ cat /etc/hostname node1
3、配置节点静态IP地址（可选）。
使用ifconfig查询本机ip和掩码（没有ifconfig命令，可以apt-get install net-tools）
w@node1:~$ ifconfig
docker0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
ether 02:42:53:5f:6a:cd txqueuelen 0 (以太网)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.199.141 netmask 255.255.255.0 broadcast 192.168.199.255
inet6 fe80::20c:29ff:fed8:ca5f prefixlen 64 scopeid 0x20<link>
ether 00:0c:29:d8:ca:5f txqueuelen 1000 (以太网)
RX packets 7904 bytes 5375252 (5.3 MB)
RX errors 1 dropped 0 overruns 0 frame 0
TX packets 6380 bytes 772741 (772.7 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
device interrupt 19 base 0x2000
以太网卡为ens33，ip为192.168.199.141，掩码为255.255.255.0，
查询网关：
w@node1:/etc/netplan$ route -n 内核 IP 路由表 目标 网关 子网掩码 标志 跃点 引用 使用 接口 0.0.0.0 192.168.199.2 0.0.0.0 UG 100 0 0 ens33 169.254.0.0 0.0.0.0 255.255.0.0 U 1000 0 0 ens33 192.168.199.0 0.0.0.0 255.255.255.0 U 100 0 0 ens33
备份 /etc/netplan/01-network-manager-all.yaml ，然后更改文件：
# Let NetworkManager manage all devices on this system
network:
version: 2
renderer: NetworkManager #和原先的保持一致
ethernets:
ens33:
dhcp4: no
addresses: [192.168.199.141/24] #静态ip/掩码
gateway4: 192.168.199.2 #网关
nameservers:
addresses: [192.168.199.141,223.6.6.6] #设置一个响应快的DNS，因后续会使用本机作为DNS,所以这里把本机加上
sudo netlan apply
重启机器
查看配置：
w@node1:~$ ifconfig
docker0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
inet 172.17.0.1 netmask 255.255.0.0 broadcast 172.17.255.255
ether 02:42:18:e9:51:20 txqueuelen 0 (以太网)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.199.141 netmask 255.255.255.0 broadcast 192.168.199.255
inet6 fe80::20c:29ff:fed8:ca5f prefixlen 64 scopeid 0x20<link>
ether 00:0c:29:d8:ca:5f txqueuelen 1000 (以太网)
RX packets 5419 bytes 4116516 (4.1 MB)
RX errors 2 dropped 2 overruns 0 frame 0
TX packets 5133 bytes 709451 (709.4 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
device interrupt 19 base 0x2000
配置ip地址和主机映射
vim /etc/hostsw@node1:~$ cat /etc/hosts 127.0.0.1 localhost 127.0.1.1 w-virtual-machine 192.168.199.141 node1
w@node1:~$ ping node1 PING node1 (192.168.199.141) 56(84) bytes of data. 64 bytes from node1 (192.168.199.141): icmp_seq=1 ttl=64 time=0.043 ms 64 bytes from node1 (192.168.199.141): icmp_seq=2 ttl=64 time=0.113 ms 64 bytes from node1 (192.168.199.141): icmp_seq=3 ttl=64 time=0.123 ms 64 bytes from node1 (192.168.199.141): icmp_seq=4 ttl=64 time=0.136 ms
4、配置Ubuntu软件源
vi /etc/apt/sources.list
在最后增加:
deb https://mirrors.aliyun.com/kubernetes/apt/ kubernetes-xenial main
apt-key.gpg是k8s的deb源公钥，加载k8s的deb源公钥命令为: 首先su root再执行：curl https://mirrors.aliyun.com/kubernetes/apt/doc/apt-key.gpg | apt-key add -
然后apt-get update
apt-cache madison kubelet查看可安装版本
5、关闭swap、防火墙
原因是swap会导致挂掉的程序靠swap续命，不能及时OOM，让k8s来接管重启容器，
关闭防火墙是因为防火墙可能阻碍集群内部组件通信。
root@node1:/home/w# ufw disable 防火墙在系统启动时自动禁用
root@node1:/home/w# swapoff -a ;sed -i '/swap/d' /etc/fstab root@node1:/home/w# cat /etc/fstab # /etc/fstab: static file system information. # # Use 'blkid' to print the universally unique identifier for a # device; this may be used with UUID= as a more robust way to name devices # that works even if disks are added and removed. See fstab(5). # # <file system> <mount point> <type> <options> <dump> <pass> # / was on /dev/sda1 during installation UUID=2aa24dbd-cf22-4c5f-91d6-bc73544fd3c2 / ext4 errors=remount-ro 0 1
6、安装docker