部署高可用keepalived元件

2022-06-08 07:03:08 字數 4283 閱讀 3722

執行 keepalived 和 haproxy 的節點稱為 lb 節點。由於 keepalived 是一主多備執行模式，故至少兩個 lb 節點。

本文件復用 master 節點的三颱機器，haproxy 監聽的埠(8443) 需要與 kube-apiserver 的埠 6443 不同，避免衝突。

keepalived 在執行過程中週期檢查本機的 haproxy 程序狀態，如果檢測到 haproxy 程序異常，則觸發重新選主的過程，vip 將飄移到新選出來的主節點，從而實現 vip 的高可用。

所有元件（如 kubeclt、apiserver、controller-manager、scheduler 等）都通過 vip 和 haproxy 監聽的 8443 埠訪問 kube-apiserver 服務。

source /opt/k8s/bin/environment.sh


for node_ip in $


doecho ">>> $"


ssh root@$ "yum install -y keepalived haproxy"


done
haproxy 配置檔案：

eof下發 haproxy.cfg 到所有 master 節點：

source /opt/k8s/bin/environment.sh


for node_ip in $


doecho ">>> $"


scp haproxy.cfg root@$:/etc/haproxy


done



source /opt/k8s/bin/environment.sh


for node_ip in $


doecho ">>> $"


ssh root@$ "systemctl restart haproxy"


done



source /opt/k8s/bin/environment.sh


for node_ip in $


doecho ">>> $"


ssh root@$ "systemctl status haproxy|grep active"


done
確保狀態為active (running)，否則檢視日誌，確認原因：

journalctl -u haproxy
檢查 haproxy 是否監聽 8443 埠：

source /opt/k8s/bin/environment.sh


for node_ip in $


doecho ">>> $"


ssh root@$ "netstat -lnpt|grep haproxy"


done
確保輸出類似於:

tcp        0      0 0.0.0.0:8443            0.0.0.0:*               listen      120583/haproxy
keepalived 是一主（master）多備（backup）執行模式，故有兩種型別的配置檔案。master 配置檔案只有乙份，backup 配置檔案視節點數目而定，對於本文件而言，規劃如下：

master 配置檔案：

source /opt/k8s/bin/environment.sh


cat  > keepalived-master.conf <


global_defs 


vrrp_script check-haproxy 


vrrp_instance vi-kube-master 


virtual_router_id 68


advert_int 3


track_script 


virtual_ipaddress }}


eof
backup 配置檔案：

source /opt/k8s/bin/environment.sh


cat  > keepalived-backup.conf <


global_defs 


vrrp_script check-haproxy 


vrrp_instance vi-kube-master 


virtual_router_id 68


advert_int 3


track_script 


virtual_ipaddress }}


eof
下發 master 配置檔案：

scp keepalived-master.conf [email protected]:/etc/keepalived/keepalived.conf
下發 backup 配置檔案：

scp keepalived-backup.conf [email protected]:/etc/keepalived/keepalived.conf


scp keepalived-backup.conf [email protected]:/etc/keepalived/keepalived.conf



source /opt/k8s/bin/environment.sh


for node_ip in $


doecho ">>> $"


ssh root@$ "systemctl restart keepalived"


done



source /opt/k8s/bin/environment.sh


for node_ip in $


doecho ">>> $"


ssh root@$ "systemctl status keepalived|grep active"


done
確保狀態為active (running)，否則檢視日誌，確認原因：

journalctl -u keepalived
檢視 vip 所在的節點，確保可以 ping 通 vip：

source /opt/k8s/bin/environment.sh


for node_ip in $


doecho ">>> $"


ssh $ "/usr/sbin/ip addr show $"


ssh $ "ping -c 1 $"


done

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