keepalived高可用
1. keepalived简介
1.1 keepalived是什么？
Keepalived 软件起初是专为LVS负载均衡软件设计的，用来管理并监控LVS集群系统中各个服务节点的状态，后来又加入了可以实现高可用的VRRP功能。因此，Keepalived除了能够管理LVS软件外，还可以作为其他服务（例如：Nginx、Haproxy、MySQL等）的高可用解决方案软件。
Keepalived软件主要是通过VRRP协议实现高可用功能的。VRRP是Virtual Router RedundancyProtocol(虚拟路由器冗余协议）的缩写，VRRP出现的目的就是为了解决静态路由单点故障问题的，它能够保证当个别节点宕机时，整个网络可以不间断地运行。
所以，Keepalived 一方面具有配置管理LVS的功能，同时还具有对LVS下面节点进行健康检查的功能，另一方面也可实现系统网络服务的高可用功能。
keepalived官网
1.2 keepalived的重要功能
keepalived 有三个重要的功能，分别是：
- 管理LVS负载均衡软件
- 实现LVS集群节点的健康检查
- 作为系统网络服务的高可用性（failover）
1.3 keepalived高可用故障转移的原理
Keepalived 高可用服务之间的故障切换转移，是通过 VRRP (Virtual Router Redundancy Protocol ,虚拟路由器冗余协议）来实现的。
在 Keepalived 服务正常工作时，主 Master 节点会不断地向备节点发送（多播的方式）心跳消息，用以告诉备 Backup 节点自己还活看，当主 Master 节点发生故障时，就无法发送心跳消息，备节点也就因此无法继续检测到来自主 Master 节点的心跳了，于是调用自身的接管程序，接管主 Master 节点的 IP 资源及服务。而当主 Master 节点恢复时，备 Backup 节点又会释放主节点故障时自身接管的IP资源及服务，恢复到原来的备用角色。
那么，什么是VRRP呢？
VRRP ,全 称 Virtual Router Redundancy Protocol ,中文名为虚拟路由冗余协议 ，VRRP的出现就是为了解决静态踣甶的单点故障问题，VRRP是通过一种竞选机制来将路由的任务交给某台VRRP路由器的。
1.4 keepalived原理
1.4.1 keepalived高可用架构图
1.4.2 keepalived工作原理描述
Keepalived高可用对之间是通过VRRP通信的，因此，我们从 VRRP开始了解起：
1) VRRP,全称 Virtual Router Redundancy Protocol,中文名为虚拟路由冗余协议，VRRP的出现是为了解决静态路由的单点故障。
2) VRRP是通过一种竟选协议机制来将路由任务交给某台 VRRP路由器的。
3) VRRP用 IP多播的方式（默认多播地址（224.0_0.18))实现高可用对之间通信。
4) 工作时主节点发包，备节点接包，当备节点接收不到主节点发的数据包的时候，就启动接管程序接管主节点的开源。备节点可以有多个，通过优先级竞选，但一般 Keepalived系统运维工作中都是一对。
5) VRRP使用了加密协议加密数据，但Keepalived官方目前还是推荐用明文的方式配置认证类型和密码。
介绍完 VRRP,接下来我再介绍一下 Keepalived服务的工作原理：
Keepalived高可用是通过 VRRP 进行通信的， VRRP是通过竞选机制来确定主备的，主的优先级高于备，因此，工作时主会优先获得所有的资源，备节点处于等待状态，当主挂了的时候，备节点就会接管主节点的资源，然后顶替主节点对外提供服务。
在 Keepalived 服务之间，只有作为主的服务器会一直发送 VRRP 广播包,告诉备它还活着，此时备不会枪占主，当主不可用时，即备监听不到主发送的广播包时，就会启动相关服务接管资源，保证业务的连续性.接管速度最快可以小于1秒。
2. keepalived配置文件讲解
主：192.168.6.152 主机名：node1
备：192.168.6.153 主机名：node2
# 主上下载nginx [root@node1 ~]# dnf -y install nginx [root@node1 ~]# echo 'RS1' > /usr/share/nginx/html/index.html #增加网页内容 [root@node1 ~]# systemctl enable --now nginx #设置开机自启 Created symlink /etc/systemd/system/multi-user.target.wants/nginx.service → /usr/lib/systemd/system/nginx.service. # 备上下载nginx [root@node2 ~]# dnf -y install nginx [root@node2 ~]# echo 'RS2' > /usr/share/nginx/html/index.html [root@node2 ~]# systemctl enable --now nginx Created symlink /etc/systemd/system/multi-user.target.wants/nginx.service → /usr/lib/systemd/system/nginx.service.
访问
# 下载keepalived [root@node1 ~]# dnf -y install keepalived #主备都下载keepalived [root@node2 ~]# dnf -y install keepalived # 查看安装生成的文件 [root@node1 ~]# rpm -ql keepalived /etc/keepalived /etc/keepalived/keepalived.conf # 主配置文件 /etc/sysconfig/keepalived /usr/bin/genhash /usr/lib/.build-id /usr/lib/.build-id/0a /usr/lib/.build-id/0a/410997e11c666114ca6d785e58ff0cc248744e /usr/lib/.build-id/6f /usr/lib/.build-id/6f/ba0d6bad6cb5ff7b074e703849ed93bebf4a0f /usr/lib/systemd/system/keepalived.service # 服务控制文件
4.3 keepalived配置
4.3.1 配置主keepalived
# [root@node1 keepalived]# cp keepalived.conf keepalived.conf123 # 把主配置文件复制一个原本的改个名备份一个 [root@node1 keepalived]# ls keepalived.conf keepalived.conf123 [root@node1 keepalived]# > keepalived.conf #清空内容 [root@node1 keepalived]# vim keepalived.conf # 编辑主配置文件 ! Configuration File for keepalived global_defs { # 全局配置 router_id lb01 } vrrp_instance VI_1 { #定义实例 state MASTER # 定义keepalived节点的初始状态，可以为MASTER和BACKUP interface ens160 # VRRP实施绑定的网卡接口， virtual_router_id 51 # 虚拟路由的ID，同一集群要一致 priority 100 #定义优先级，按优先级来决定主备角色优先级越大越有限 advert_int 1 # 主备通讯时间间隔 authentication { #配置认证 auth_type PASS #认证方式此处为密码 auth_pass 023654 # 修改密码 } virtual_ipaddress { #要使用的VIP地址 192.168.6.250 # 修改vip } } virtual_server 192.168.6.250 80 { # 配置虚拟服务器 delay_loop 6 # 健康检查时间间隔 lb_algo rr # lvs调度算法 lb_kind DR #lvs模式 persistence_timeout 50 #持久化超时时间，单位是秒 protocol TCP #4层协议 real_server 192.168.6.152 80 { # 定义真实处理请求的服务器 weight 1 # 给服务器指定权重，默认为1 TCP_CHECK { connect_port 80 #端口号为80 connect_timeout 3 # 连接超时时间 nb_get_retry 3 # 连接次数 delay_before_retry 3 # 在尝试之前延迟多少时间 } } real_server 192.168.6.153 80 { weight 1 TCP_CHECK { connect_port 80 connect_timeout 3 nb_get_retry 3 delay_before_retry 3 } } } [root@node1 keepalived]# systemctl enable --now keepalived Created symlink /etc/systemd/system/multi-user.target.wants/keepalived.service → /usr/lib/systemd/system/keepalived.service.
配置备keepalived
# [root@node2 ~]# cd /etc/keepalived/ [root@node2 keepalived]# ls keepalived.conf [root@node2 keepalived]# cp keepalived.conf keepalived.conf123 [root@node2 keepalived]# > keepalived.conf [root@node2 keepalived]# vim /etc/keepalived/keepalived.conf ! Configuration File for keepalived global_defs { router_id lb02 } vrrp_instance VI_1 { state BACKUP interface ens160 virtual_router_id 51 priority 90 advert_int 1 authentication { auth_type PASS auth_pass 023654 } virtual_ipaddress { 192.168.6.250 } } virtual_server 192.168.6.250 80 { delay_loop 6 lb_algo rr lb_kind DR persistence_timeout 50 protocol TCP real_server 192.168.6.152 80 { weight 1 TCP_CHECK { connect_port 80 connect_timeout 3 nb_get_retry 3 delay_before_retry 3 } } real_server 192.168.6.153 80 { weight 1 TCP_CHECK { connect_port 80 connect_timeout 3 nb_get_retry 3 delay_before_retry 3 } } }
[root@node2 keepalived]# systemctl enable --now keepalived
Created symlink /etc/systemd/system/multi-user.target.wants/keepalived.service → /usr/lib/systemd/system/keepalived.service.
查看VIP在哪里
# 在MASTER上查看 [root@node1 keepalived]# ip a 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000 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 inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: ens160: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000 link/ether 00:0c:29:d7:b0:2d brd ff:ff:ff:ff:ff:ff inet 192.168.6.152/24 brd 192.168.6.255 scope global dynamic noprefixroute ens160 valid_lft 1765sec preferred_lft 1765sec inet 192.168.6.250/32 scope global ens160 # 主上有vip valid_lft forever preferred_lft forever inet6 fe80::6e9:511e:b6a8:693c/64 scope link noprefixroute valid_lft forever preferred_lft forever #在SLAVE上查看 [root@node2 keepalived]# ip a 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000 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 inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: ens160: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000 link/ether 00:0c:29:42:d0:bc brd ff:ff:ff:ff:ff:ff inet 192.168.6.153/24 brd 192.168.6.255 scope global dynamic noprefixroute ens160 valid_lft 1789sec preferred_lft 1789sec inet6 fe80::da77:9e16:6359:1029/64 scope link noprefixroute valid_lft forever preferred_lft forever
让keepalived监控nginx负载均衡机
keepalived通过脚本来监控nginx负载均衡机的状态
在master上编写脚本
[root@node1 ~]# mkdir /scripts # 创建一个脚本目录为了标准化 [root@node1 ~]# cd /scripts/ [root@node1 scripts]# vim check_n.sh #编写健康检查脚本 #!/bin/bash # nginx停掉就停掉keeplived nginx_status=$(ps -ef|grep -Ev "grep|$0"|grep '\bnginx\b'|wc -l) if [ $nginx_status -lt 1 ];then systemctl stop keepalived fi [root@node1 scripts]# chmod +x check_n.sh # 增加执行权限 [root@node1 scripts]# ll total 4 -rwxr-xr-x 1 root root 142 Aug 30 23:28 check_n.sh [root@node1 scripts]# vim notify.sh #!/bin/bash case "$1" in master) nginx_status=$(ps -ef|grep -Ev "grep|$0"|grep '\bnginx\b'|wc -l) if [ $nginx_status -lt 1 ];then systemctl start nginx fi sendmail ;; backup) nginx_status=$(ps -ef|grep -Ev "grep|$0"|grep '\bnginx\b'|wc -l) if [ $nginx_status -gt 0 ];then systemctl stop nginx fi ;; *) echo "Usage:$0 master|backup VIP" ;; esac [root@node1 scripts]# chmod +x notify.sh [root@node1 scripts]# ll total 8 -rwxr-xr-x 1 root root 142 Aug 30 23:28 check_n.sh -rwxr-xr-x 1 root root 444 Aug 30 23:32 notify.sh
在slave上编写脚本
[root@node2 ~]# mkdir /scripts #创建脚本目录为了标准化 [root@node2 ~]# cd /scripts/ [root@node2 scripts]# vim notify.sh #!/bin/bash case "$1" in master) # 为主的时候启动nginx服务 nginx_status=$(ps -ef|grep -Ev "grep|$0"|grep '\bnginx\b'|wc -l) if [ $nginx_status -lt 1 ];then systemctl start nginx fi sendmail ;; backup) # 为备的时候停nginx服务释放资源， nginx_status=$(ps -ef|grep -Ev "grep|$0"|grep '\bnginx\b'|wc -l) if [ $nginx_status -gt 0 ];then systemctl stop nginx fi ;; *) echo "Usage:$0 master|backup VIP" ;; esac [root@node2 scripts]# chmod +x notify.sh # 增加权限 [root@node2 scripts]# ll total 4 -rwxr-xr-x 1 root root 445 Aug 30 23:39 notify.sh
配置keepalived加入监控脚本的配置
配置主keepalived
[root@node1 scripts]# vim /etc/keepalived/keepalived.conf ! Configuration File for keepalived global_defs { router_id lb01 } vrrp_script nginx_check { script "/scripts/check_n.sh" interval 1 weight -20 } vrrp_instance VI_1 { state MASTER interface ens160 virtual_router_id 51 priority 100 advert_int 1 authentication { auth_type PASS auth_pass 023654 } virtual_ipaddress { 192.168.6.250 } track_script { nginx_check } notify_master "/scripts/notify.sh master 192.168.6.250" } virtual_server 192.168.6.250 80 { delay_loop 6 lb_algo rr lb_kind DR persistence_timeout 50 protocol TCP real_server 192.168.6.152 80 { weight 1 TCP_CHECK { connect_port 80 connect_timeout 3 nb_get_retry 3 delay_before_retry 3 } } real_server 192.168.6.153 80 { weight 1 TCP_CHECK { connect_port 80 connect_timeout 3 nb_get_retry 3 delay_before_retry 3 } } } [root@node1 scripts]# systemctl restart keepalived
配置备keepalived
backup无需检测nginx是否正常，当升级为MASTER时启动nginx，当降级为BACKUP时关闭
[root@node2 scripts]# vim /etc/keepalived/keepalived.conf ! Configuration File for keepalived global_defs { router_id lb02 } vrrp_instance VI_1 { state BACKUP interface ens160 virtual_router_id 51 priority 90 advert_int 1 authentication { auth_type PASS auth_pass 023654 } virtual_ipaddress { 192.168.6.250 } notify_master "/scripts/notify.sh master 192.168.6.250" notify_backup "/scripts/notify.sh backup 192.168.6.250" } virtual_server 192.168.6.250 80 { delay_loop 6 lb_algo rr lb_kind DR persistence_timeout 50 protocol TCP real_server 192.168.6.152 80 { weight 1 TCP_CHECK { connect_port 80 connect_timeout 3 nb_get_retry 3 delay_before_retry 3 } } real_server 192.168.6.153 80 { weight 1 TCP_CHECK { connect_port 80 connect_timeout 3 nb_get_retry 3 delay_before_retry 3 } } } [root@node2 scripts]# systemctl restart keepalived
模拟主出现问题挂掉了
[root@node1 keepalived]# ss -antl #有80端口 State Recv-Q Send-Q Local Address:Port Peer Address:Port Process LISTEN 0 128 0.0.0.0:80 0.0.0.0:* LISTEN 0 128 0.0.0.0:22 0.0.0.0:* LISTEN 0 128 [::]:80 [::]:* LISTEN 0 128 [::]:22 [::]:* [root@node1 keepalived]# ip a # 有vip 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000 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 inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: ens160: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000 link/ether 00:0c:29:d7:b0:2d brd ff:ff:ff:ff:ff:ff inet 192.168.6.152/24 brd 192.168.6.255 scope global dynamic noprefixroute ens160 valid_lft 1359sec preferred_lft 1359sec inet 192.168.6.250/32 scope global ens160 valid_lft forever preferred_lft forever inet6 fe80::6e9:511e:b6a8:693c/64 scope link noprefixroute valid_lft forever preferred_lft forever [root@node1 keepalived]# systemctl status keepalived #keepalived是启动的 ● keepalived.service - LVS and VRRP High Availability Monitor Loaded: loaded (/usr/lib/systemd/system/keepalived.service; enabled; vendor preset: disa> Active: active (running) since Wed 2022-08-31 09:33:52 CST; 3min 16s ago Process: 13631 ExecStart=/usr/sbin/keepalived $KEEPALIVED_OPTIONS (code=exited, status=0/> Main PID: 13633 (keepalived) Tasks: 3 (limit: 11202) Memory: 6.4M CGroup: /system.slice/keepalived.service ├─13633 /usr/sbin/keepalived -D ├─13635 /usr/sbin/keepalived -D └─13636 /usr/sbin/keepalived -D
停掉主的
[root@node1 keepalived]# systemctl stop nginx # 模拟主当机，关闭nginx服务 [root@node1 keepalived]# ss -antl #80端口号没有了 State Recv-Q Send-Q Local Address:Port Peer Address:Port Process LISTEN 0 128 0.0.0.0:22 0.0.0.0:* LISTEN 0 128 [::]:22 [::]:* [root@node1 keepalived]# ip a #vip也没有了 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000 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 inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: ens160: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000 link/ether 00:0c:29:d7:b0:2d brd ff:ff:ff:ff:ff:ff inet 192.168.6.152/24 brd 192.168.6.255 scope global dynamic noprefixroute ens160 valid_lft 937sec preferred_lft 937sec inet6 fe80::6e9:511e:b6a8:693c/64 scope link noprefixroute valid_lft forever preferred_lft forever [root@node1 keepalived]# systemctl status keepalived # keepalived也停掉了 ● keepalived.service - LVS and VRRP High Availability Monitor Loaded: loaded (/usr/lib/systemd/system/keepalived.service; enabled; vendor preset: disa> Active: inactive (dead) since Wed 2022-08-31 09:40:39 CST; 31s ago Process: 13631 ExecStart=/usr/sbin/keepalived $KEEPALIVED_OPTIONS (code=exited, status=0/> Main PID: 13633 (code=exited, status=0/SUCCESS)
查看备主机
[root@node2 keepalived]# ss -antl # 立马接收资源80端口起来了 State Recv-Q Send-Q Local Address:Port Peer Address:Port Process LISTEN 0 128 0.0.0.0:22 0.0.0.0:* LISTEN 0 128 0.0.0.0:80 0.0.0.0:* LISTEN 0 128 [::]:22 [::]:* LISTEN 0 128 [::]:80 [::]:* [root@node2 keepalived]# ip a # vip也起来了 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000 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 inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: ens160: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000 link/ether 00:0c:29:42:d0:bc brd ff:ff:ff:ff:ff:ff inet 192.168.6.153/24 brd 192.168.6.255 scope global dynamic noprefixroute ens160 valid_lft 1723sec preferred_lft 1723sec inet 192.168.6.250/32 scope global ens160 valid_lft forever preferred_lft forever inet6 fe80::da77:9e16:6359:1029/64 scope link noprefixroute valid_lft forever preferred_lft forever [root@node2 keepalived]# systemctl status keepalived # keeplived启动了 ● keepalived.service - LVS and VRRP High Availability Monitor Loaded: loaded (/usr/lib/systemd/system/keepalived.service; enabled; vendor preset: disa> Active: active (running) since Wed 2022-08-31 09:29:30 CST; 13min ago Process: 16872 ExecStart=/usr/sbin/keepalived $KEEPALIVED_OPTIONS (code=exited, status=0/> Main PID: 16873 (keepalived) Tasks: 3 (limit: 11202) Memory: 5.2M CGroup: /system.slice/keepalived.service ├─16873 /usr/sbin/keepalived -D ├─16875 /usr/sbin/keepalived -D └─16876 /usr/sbin/keepalived -D
此时访问到的是rs2
模拟主修复好了，重新启动，立马抢占资源，vip，备停掉
# 主
[root@node1 keepalived]# systemctl start nginx keepalived [root@node1 keepalived]# ss -antl State Recv-Q Send-Q Local Address:Port Peer Address:Port Process LISTEN 0 128 0.0.0.0:80 0.0.0.0:* LISTEN 0 128 0.0.0.0:22 0.0.0.0:* LISTEN 0 128 [::]:80 [::]:* LISTEN 0 128 [::]:22 [::]:* [root@node1 keepalived]# ip a 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000 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 inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: ens160: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000 link/ether 00:0c:29:d7:b0:2d brd ff:ff:ff:ff:ff:ff inet 192.168.6.152/24 brd 192.168.6.255 scope global dynamic noprefixroute ens160 valid_lft 1503sec preferred_lft 1503sec inet 192.168.6.250/32 scope global ens160 valid_lft forever preferred_lft forever inet6 fe80::6e9:511e:b6a8:693c/64 scope link noprefixroute valid_lft forever preferred_lft forever [root@node1 keepalived]# systemctl status keeplived Unit keeplived.service could not be found. [root@node1 keepalived]# systemctl status keepalived ● keepalived.service - LVS and VRRP High Availability Monitor Loaded: loaded (/usr/lib/systemd/system/keepalived.service; enabled; vendor preset: disa> Active: active (running) since Wed 2022-08-31 09:46:23 CST; 36s ago Process: 16114 ExecStart=/usr/sbin/keepalived $KEEPALIVED_OPTIONS (code=exited, status=0/> Main PID: 16115 (keepalived) Tasks: 3 (limit: 11202) Memory: 6.1M CGroup: /system.slice/keepalived.service ├─16115 /usr/sbin/keepalived -D ├─16116 /usr/sbin/keepalived -D └─16117 /usr/sbin/keepalived -D
# 备 [root@node2 keepalived]# ss -antl State Recv-Q Send-Q Local Address:Port Peer Address:Port Process LISTEN 0 128 0.0.0.0:22 0.0.0.0:* LISTEN 0 128 [::]:22 [::]:* [root@node2 keepalived]# systemctl status keepalived ● keepalived.service - LVS and VRRP High Availability Monitor Loaded: loaded (/usr/lib/systemd/system/keepalived.service; enabled; vendor preset: disa> Active: active (running) since Wed 2022-08-31 09:54:22 CST; 8min ago Process: 17022 ExecStart=/usr/sbin/keepalived $KEEPALIVED_OPTIONS (code=exited, status=0/> Main PID: 17023 (keepalived) Tasks: 3 (limit: 11202) Memory: 5.3M CGroup: /system.slice/keepalived.service ├─17023 /usr/sbin/keepalived -D ├─17024 /usr/sbin/keepalived -D └─17025 /usr/sbin/keepalived -D
[root@node2 keepalived]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
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
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: ens160: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
link/ether 00:0c:29:42:d0:bc brd ff:ff:ff:ff:ff:ff
inet 192.168.6.153/24 brd 192.168.6.255 scope global dynamic noprefixroute ens160
valid_lft 1285sec preferred_lft 1285sec
inet6 fe80::da77:9e16:6359:1029/64 scope link noprefixroute
valid_lft forever preferred_lft forever
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