1. # 拉取haproxy镜像
  2. docker pull haproxy:1.7.8-alpine
  3. mkdir /etc/haproxy
  4. cat >/etc/haproxy/haproxy.cfg<<EOF
  5. global
  6.   log 127.0.0.1 local0 err
  7.   maxconn 50000
  8.   uid 99
  9.   gid 99
  10.   #daemon
  11.   nbproc 1
  12.   pidfile haproxy.pid
  14. defaults
  15.   mode http
  16.   log 127.0.0.1 local0 err
  17.   maxconn 50000
  18.   retries 3
  19.   timeout connect 5s
  20.   timeout client 30s
  21.   timeout server 30s
  22.   timeout check 2s
  24. listen admin_stats
  25.   mode http
  26.   bind 0.0.0.0:1080
  27.   log 127.0.0.1 local0 err
  28.   stats refresh 30s
  29.   stats uri     /haproxy-status
  30.   stats realm   Haproxy\ Statistics
  31.   stats auth    will:will
  32.   stats hide-version
  33.   stats admin if TRUE
  35. frontend k8s-https
  36.   bind 0.0.0.0:8443
  37.   mode tcp
  38.   #maxconn 50000
  39.   default_backend k8s-https
  41. backend k8s-https
  42.   mode tcp
  43.   balance roundrobin
  44.   server lab1 192.168.105.92:6443 weight 1 maxconn 1000 check inter 2000 rise 2 fall 3
  45.   server lab2 192.168.105.93:6443 weight 1 maxconn 1000 check inter 2000 rise 2 fall 3
  46.   server lab3 192.168.105.94:6443 weight 1 maxconn 1000 check inter 2000 rise 2 fall 3
  47. EOF
  49. # 启动haproxy
  50. docker run -d --name my-haproxy \
  51. -v /etc/haproxy:/usr/local/etc/haproxy:ro \
  52. -p 8443:8443 \
  53. -p 1080:1080 \
  54. --restart always \
  55. haproxy:1.7.8-alpine
  57. # 查看日志
  58. docker logs my-haproxy
  60. # 浏览器查看状态
  61. http://192.168.105.92:1080/haproxy-status
  62. http://192.168.105.93:1080/haproxy-status
  63. http://192.168.105.94:1080/haproxy-status
  65. # 拉取keepalived镜像
  66. docker pull osixia/keepalived:1.4.4
  68. # 启动
  69. # 载入内核相关模块
  70. lsmod | grep ip_vs
  71. modprobe ip_vs
  73. # 启动keepalived
  74. # ens32为本次实验192.168.105.0/24网段的所在网卡
  75. docker run --net=host --cap-add=NET_ADMIN \
  76. -e KEEPALIVED_INTERFACE=ens32 \
  77. -e KEEPALIVED_VIRTUAL_IPS="#PYTHON2BASH:['192.168.105.99']" \
  78. -e KEEPALIVED_UNICAST_PEERS="#PYTHON2BASH:['192.168.105.92','192.168.105.93','192.168.105.94']" \
  79. -e KEEPALIVED_PASSWORD=hello \
  80. --name k8s-keepalived \
  81. --restart always \
  82. -d osixia/keepalived:1.4.4
  84. # 查看日志
  85. # 会看到两个成为backup 一个成为master
  86. docker logs k8s-keepalived
  88. # 此时会配置 192.168.105.99 到其中一台机器
  89. # ping测试
  90. ping -c4 192.168.105.99
  92. # 如果失败后清理后，重新实验
  93. #docker rm -f k8s-keepalived
  94. #ip a del 192.168.105.99/32 dev ens32

测试Haproxy高可用


  2. #抓个包看看现在VIP在哪台机器上，然后去关掉这台机器
  4. tcpdump -nn host 224.0.100.100
  6. [root@master2 ~]# tcpdump -nn host 224.0.100.100
  7. tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
  8. listening on eth0, link-type EN10MB (Ethernet), capture size 262144 bytes
  9. 17:45:59.768033 IP 192.168.1.4 > 224.0.100.100: VRRPv2, Advertisement, vrid 6, prio 100, authtype simple, intvl 1s, length 20
  10. 17:46:00.769503 IP 192.168.1.4 > 224.0.100.100: VRRPv2, Advertisement, vrid 6, prio 100, authtype simple, intvl 1s, length 20
  11. 17:46:01.771062 IP 192.168.1.4 > 224.0.100.100: VRRPv2, Advertisement, vrid 6, prio 100, authtype simple, intvl 1s, length 20
  12. ^C
  14. #现在VIP是在192.168.1.4这台主机上，关掉这台机器
  15. init 0
  17. #关掉之后发现192.168.1.5立马接管了。现在VIP是在1.5上
  18. [root@node3 ~]# tcpdump -nn host 224.0.100.100
  19. tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
  20. listening on eth0, link-type EN10MB (Ethernet), capture size 262144 bytes
  21. 17:48:25.031679 IP 192.168.1.4 > 224.0.100.100: VRRPv2, Advertisement, vrid 6, prio 100, authtype simple, intvl 1s, length 20
  22. 17:48:26.033805 IP 192.168.1.4 > 224.0.100.100: VRRPv2, Advertisement, vrid 6, prio 100, authtype simple, intvl 1s, length 20
  23. 17:48:27.035313 IP 192.168.1.4 > 224.0.100.100: VRRPv2, Advertisement, vrid 6, prio 100, authtype simple, intvl 1s, length 20
  24. 17:48:28.036628 IP 192.168.1.4 > 224.0.100.100: VRRPv2, Advertisement, vrid 6, prio 100, authtype simple, intvl 1s, length 20
  25. 17:48:29.039011 IP 192.168.1.4 > 224.0.100.100: VRRPv2, Advertisement, vrid 6, prio 100, authtype simple, intvl 1s, length 20
  26. 17:48:30.041249 IP 192.168.1.4 > 224.0.100.100: VRRPv2, Advertisement, vrid 6, prio 100, authtype simple, intvl 1s, length 20
  27. 17:48:31.043065 IP 192.168.1.4 > 224.0.100.100: VRRPv2, Advertisement, vrid 6, prio 100, authtype simple, intvl 1s, length 20
  28. 17:48:32.045007 IP 192.168.1.4 > 224.0.100.100: VRRPv2, Advertisement, vrid 6, prio 100, authtype simple, intvl 1s, length 20
  29. 17:48:33.046781 IP 192.168.1.4 > 224.0.100.100: VRRPv2, Advertisement, vrid 6, prio 100, authtype simple, intvl 1s, length 20
  30. 17:48:34.048776 IP 192.168.1.4 > 224.0.100.100: VRRPv2, Advertisement, vrid 6, prio 100, authtype simple, intvl 1s, length 20
  31. 17:48:35.051280 IP 192.168.1.4 > 224.0.100.100: VRRPv2, Advertisement, vrid 6, prio 100, authtype simple, intvl 1s, length 20
  32. 17:48:35.929482 IP 192.168.1.4 > 224.0.100.100: VRRPv2, Advertisement, vrid 6, prio 0, authtype simple, intvl 1s, length 20
  33. 17:48:36.618749 IP 192.168.1.5 > 224.0.100.100: VRRPv2, Advertisement, vrid 6, prio 80, authtype simple, intvl 1s, length 20
  34. 17:48:37.699849 IP 192.168.1.5 > 224.0.100.100: VRRPv2, Advertisement, vrid 6, prio 80, authtype simple, intvl 1s, length 20
  35. 17:48:38.700669 IP 192.168.1.5 > 224.0.100.100: VRRPv2, Advertisement, vrid 6, prio 80, authtype simple, intvl 1s, length 20
  36. 17:48:39.702840 IP 192.168.1.5 > 224.0.100.100: VRRPv2, Advertisement, vrid 6, prio 80, authtype simple, intvl 1s, length 20
  37. 17:48:40.704254 IP 192.168.1.5 > 224.0.100.100: VRRPv2, Advertisement, vrid 6, prio 80, authtype simple, intvl 1s, length 20
  38. 17:48:41.706221 IP 192.168.1.5 > 224.0.100.100: VRRPv2, Advertisement, vrid 6, prio 80, authtype simple, intvl 1s, length 20
  39. 17:48:42.706478 IP 192.168.1.5 > 224.0.100.100: VRRPv2, Advertisement, vrid 6, prio 80, authtype simple, intvl 1s, length 20
  40. ^C
  41. 19 packets captured
  42. 326 packets received by filter
  43. 172 packets dropped by kernel
  45. #切换到master2，再创建个POD试试
  46. kubectl run curl --image=radial/busyboxplus:curl -i --tty
  47. date
  48. exit
  49. kubectl delete deployment curl
  51. [root@master2 ~]# kubectl run curl --image=radial/busyboxplus:curl -i --tty
  52. If you don't see a command prompt, try pressing enter.
  53. [ root@curl-87b54756-xfgrn:/ ]$ date
  54. Thu Sep 13 09:50:58 UTC 2018
  55. [ root@curl-87b54756-xfgrn:/ ]$
  56. [ root@curl-87b54756-xfgrn:/ ]$ exit
  57. Session ended, resume using 'kubectl attach curl-87b54756-xfgrn -c curl -i -t' command when the pod is running
  58. [root@master2 ~]# kubectl delete deployment curl
  59. deployment.extensions "curl" deleted

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