使用kube-vip部署高可用K8S集群
目前高可用部署方式1.haproxy+keepalived（复杂）
2.sealos（一键部署，目前高版本底层使用的是containerd）
3.kubeadm+kube-vip（灵活，方便）
本文使用第三种方式，K8S版本1.20.4
环境：centos7.6
m1-192.168.50.201
m2-192.168.50.202
m3-192.168.50.203
vip-192.168.50.200
三台服务器均需要操作
绛旓細鐩墠楂樺彲鐢ㄩ儴缃鏂瑰紡 1.haproxy+keepalived锛堝鏉傦級2.sealos锛堜竴閿儴缃诧紝鐩墠楂樼増鏈簳灞浣跨敤鐨勬槸containerd锛3.kubeadm+kube-vip锛堢伒娲伙紝鏂逛究锛夋湰鏂囦娇鐢ㄧ涓夌鏂瑰紡锛孠8S鐗堟湰1.20.4 鐜锛歝entos7.6 m1-192.168.50.201 m2-192.168.50.202 m3-192.168.50.203 vip-192.168.50.200 涓夊彴鏈嶅姟鍣ㄥ潎闇瑕...
绛旓細k8s闆嗙兢楂樺彲鐢锛屼竴鑸槸etcd锛宬ube-apiserver锛宬ube-controller-manager锛宬ube-scheduler鏈嶅姟缁勪欢鐨勯珮鍙敤銆傝鍒掞細3涓猰aster鑺傜偣锛2涓獁orker鑺傜偣锛屼娇鐢╧eepalived+haproxy鍋氶珮鍙敤 涓銆佸墠鏈熺幆澧冨噯澶 Kubernetes 1.8寮濮嬭姹傚叧闂郴缁熺殑Swap锛屽鏋滀笉鍏抽棴锛岄粯璁ら厤缃笅kubelet灏嗘棤娉曞惎鍔ㄣ傛柟娉曚竴 閫氳繃kubelet鐨勫惎鍔ㄥ弬鏁扳揻...
绛旓細keepalived鏄互VRRP(铏氭嫙璺敱鍐椾綑鍗忚)鍗忚涓哄熀纭, 鍖呮嫭涓涓猰aster鍜屽涓猙ackup銆 master鍔寔vip瀵瑰鎻愪緵鏈嶅姟銆俶aster鍙戦佺粍鎾紝backup鑺傜偣鏀朵笉鍒皏rrp鍖呮椂璁や负master瀹曟満锛屾鏃堕夊嚭鍓╀綑浼樺厛绾ф渶楂樼殑鑺傜偣浣滀负鏂扮殑master, 鍔寔vip銆俴eepalived鏄繚璇楂樺彲鐢鐨勯噸瑕佺粍浠躲俴eepalived鍙畨瑁呭湪涓绘満涓婏紝涔熷彲浣跨敤docker瀹瑰櫒瀹...
绛旓細鐢变簬鐗堟湰鏇存柊棰戠箒锛岃繖閲屾寚瀹氱増鏈彿閮ㄧ讲锛6.1 鍒涘缓kubeadm閰嶇疆鏂囦欢 鍦ㄥ叿鏈vip鐨刴aster涓婃搷浣滐紝杩欓噷涓簃aster1 6.2 鍦╩aster1鑺傜偣鎵ц 鎸夌収鎻愮ず淇濆瓨浠ヤ笅鍐呭锛屼竴浼氳浣跨敤锛坘ubeadm init涓殑鍥炴樉鍐呭锛夛細鎸夌収鎻愮ず閰嶇疆鐜鍙橀噺锛屼娇鐢╧ubectl宸ュ叿锛氭煡鐪嬮泦缇ょ姸鎬 鍒涘缓kube-flannel.yml锛屽湪master1涓婃墽琛 瀹夎flannel缃...
绛旓細Kubernetes Service閫氳繃IPVS瀹炵幇锛孭od浣滀负IPVS Service鐨凷erver锛岄氳繃NAT鍜孧QSQ瀹炵幇杞彂銆kube-proxy鍦ㄦ墍鏈塏ode鑺傜偣涓婃墽琛屼笁浠朵簨锛氬垱寤VIP锛屽疄鐜拌礋杞藉潎琛★紝澶勭悊绔彛鏄犲皠銆傞殢鐫Kubernetes鐨勯儴缃茶妯″拰搴旂敤鑼冨洿鐨勬墿澶э紝IPVS蹇呯劧浼氬彇浠ptables鎴愪负Kubernetes Service鐨勯粯璁ゅ疄鐜板悗绔
绛旓細Kubernetes涓轰簡瀹炵幇鍦ㄩ泦缇ゆ墍鏈夌殑鑺傜偣閮借兘澶熻闂甋ervice,kube-proxy榛樿浼氬湪鎵鏈夌殑Node鑺傜偣閮藉垱寤鸿繖涓VIP骞朵笖瀹炵幇璐熻浇,鎵浠ュ湪閮ㄧ讲Kubernetes鍚庡彂鐜発ube-proxy鏄竴涓狣aemonSet銆 鑰孲ervice璐熻浇涔嬫墍浠ヨ兘澶熷湪Node鑺傜偣涓婂疄鐜版槸鍥犱负鏃犺Kubernetes浣跨敤鍝釜缃戠粶妯″瀷,鍧囬渶瑕佷繚璇佹弧瓒冲涓嬩笁涓潯浠: 鑷冲皯绗2鐐规槸蹇呴』婊¤冻鐨,鏈変簡濡備笂鍑犱釜...
绛旓細Etcd闆嗙兢鐨閮ㄧ讲鏈変笁绉嶆柟寮忥紝鍏蜂綋鐨勫畨瑁呮楠ゅ彲浠ユ煡鐪嬪畼鏂规墜鍐岋紝姝ゅ涓嶅啀璇︾粏浠嬬粛銆3. Kubernetes master鏈嶅姟楂樺彲鐢鏂规 Kubernetes鐨勭鐞嗗眰鏈嶅姟鍖呮嫭kube-scheduler鍜宬ube-controller-manager銆俴ube-scheduer鍜宬ube-controller-manager浣跨敤涓涓诲浠庣殑楂樺彲鐢ㄦ柟妗堬紝鍦ㄥ悓涓鏃跺埢鍙厑璁镐竴涓湇鍔″浠ュ叿浣撶殑浠诲姟銆侹ubernetes涓...
绛旓細API鍦 k8s.io/metrics 瀛樺偍搴撲腑瀹氫箟銆傛偍鍙互鍦ㄩ偅閲屾壘鍒版湁鍏矨PI鐨勬洿澶氫俊鎭侻etrics Server 瀹炵幇浜哅etrics API銆侻etrics Server 鏄泦缇よ寖鍥磋祫婧浣跨敤鏁版嵁鐨勮仛鍚堝櫒銆 浠 Kubernetes 1.8 寮濮嬶紝瀹冧綔涓轰竴涓 Deployment 瀵硅薄榛樿閮ㄧ讲鍦ㄧ敱 kube-up.sh 鑴氭湰鍒涘缓鐨勯泦缇や腑銆 濡傛灉浣犱娇鐢ㄤ簡鍏朵粬鐨 Kubernetes ...
绛旓細1. 鍑嗗宸ヤ綔 涓绘満鍚嶄笌缃戠粶璁剧疆锛氱‘淇濇墍鏈夎妭鐐逛富鏈哄悕姝ｇ‘锛宧osts鏂囦欢閰嶇疆锛岄厤缃甋SH浜掍俊锛屾椂闂村悓姝ワ紝骞跺叧闂槻鐏銆備复鏃剁鐢╯wap锛岀鐢⊿ELinux浠ヤ紭鍖栨ц兘銆 杞欢瀹夎锛氬畨瑁匘ocker銆乲ubernetes鐩稿叧渚濊禆锛屽kubeadm, kubelet, kubectl, CNI, IPVS, 鍜屽繀瑕佺殑楂樺彲鐢鎬у伐鍏枫 2. 闆嗙兢鎼缓 鍚敤iptables妗...
绛旓細Sealos 鏄竴涓 Go 璇█寮鍙戠殑绠鍗曞共鍑涓旇交閲忕殑 Kubernetes 闆嗙兢閮ㄧ讲宸ュ叿锛 Sealos 鑳藉緢濂界殑鏀寔鍦ㄧ敓浜х幆澧冧腑閮ㄧ讲楂樺彲鐢鐨 Kubernetes 闆嗙兢銆傛棤璁烘槸閫氳繃 KeepAlived 杩樻槸 HAProxy 杩涜楂樺彲鐢ㄩ泦缇よ皟搴﹂兘浼氬瓨鍦ㄤ互涓嬩竴浜涘姡鍔裤係ealos 楂樺彲鐢ㄥ疄鐜版槸閫氳繃鏈湴璐熻浇鏂瑰紡瀹屾垚鐨勩傛湰鍦拌礋杞藉疄鐜版柟寮忔湁澶氱锛屾瘮濡傦細 IPVS 銆...
