Heim > Artikel > Backend-Entwicklung > Keepalived Nginx implementiert Dual-Master-Lastausgleich mit hoher Verfügbarkeit
Diese Lösung verwendet zwei VIP-Adressen, und das Frontend verwendet zwei Maschinen, die jeweils andere als Master und Backup fungiert, und zwei Maschinen Gleichzeitig arbeiten: Wenn eine der Maschinen ausfällt, werden die Anforderungen der beiden Maschinen auf die Last einer Maschine übertragen, was für die aktuelle Architekturumgebung sehr gut geeignet ist. Daher wird diese Lösung zur Implementierung einer Hochverfügbarkeitsarchitektur verwendet für die Website.
Nachfolgend verwenden wir die zweite Konfiguration, um den Dual-Master-Lastausgleich mit hoher Verfügbarkeit zu demonstrieren.
Gruppe 1
VIP1: 192.168.36.100
Primäres Nginx: 192.168.36.99
Backup-Nginx: 192.168.36.86
Gruppe 2
VIP2: 192.168.36.100
Haupt-Nginx: 192.168.36.86
Backup-Nginx: 192.168.36.99
Webdienst:
web1: 192.168.36.215
web2: 192.168.36.80
1. Nginx-Konfiguration (wird für die Installation weggelassen)
worker_processes 1; events { worker_connections 1024; } http { include mime.types; default_type application/octet-stream; sendfile on; upstream web1 { server 192.168.36.215:80 max_fails=3 fail_timeout=3s; } upstream web2 { server 192.168.36.80:80 max_fails=3 fail_timeout=3s; } server { listen 88; server_name localhost; location / { root html; index index.html index.htm; proxy_pass http://web1; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; } } server { listen 99; server_name localhost; location / { root html; index index.html index.htm; proxy_pass http://web2; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; } } }Nginx von 192.168.36.99 und 192.168.36.86 konfigurieren und starten. Überprüfen Sie, ob der Zugriff normal ist.
web1
http://192.168.36.86:88 /
http://192.168.36.99:88/
web2
http://192.168.36.86:99/
http://192.168.36.99:99/
2. Keepalived installieren und konfigurieren (Installation entfällt)
1)192.168.36.86 Konfiguration
vi /etc/keepalived/keepalived.conf
! Configuration File for keepalived global_defs { notification_email { monitor@3evip.cn #failover@firewall.loc } notification_email_from tianwei7518@163.com smtp_server smtp.163.com smtp_connect_timeout 30 router_id LVS_DEVEL } vrrp_script chk_nginx { script "/etc/keepalived/chk_nginx.sh" interval 2 weight 2 } vrrp_instance VI_1 { state BACKUP interface eth0 virtual_router_id 100 priority 50 advert_int 1 authentication { auth_type PASS auth_pass 1111 } track_script { chk_nginx } virtual_ipaddress { 192.168.36.100 } } vrrp_instance VI_2 { state MASTER interface eth0 virtual_router_id 200 priority 100 advert_int 1 authentication { auth_type PASS auth_pass 1111 } track_script { chk_nginx } virtual_ipaddress { 192.168.36.200 } }2)192.168.36.99 Konfiguration
vi /etc/ keepalived/keepalived.conf
! Configuration File for keepalived global_defs { notification_email { monitor@3evip.cn #failover@firewall.loc } notification_email_from tianwei7518@163.com smtp_server smtp.163.com smtp_connect_timeout 30 router_id LVS_DEVEL } vrrp_script chk_nginx { script "/etc/keepalived/chk_nginx.sh" interval 2 weight 2 } vrrp_instance VI_1 { state MASTER interface eth0 virtual_router_id 100 priority 100 advert_int 1 authentication { auth_type PASS auth_pass 1111 } track_script { chk_nginx } virtual_ipaddress { 192.168.36.100 } } vrrp_instance VI_2 { state BACKUP interface eth0 virtual_router_id 200 priority 50 advert_int 1 authentication { auth_type PASS auth_pass 1111 } track_script { chk_nginx } virtual_ipaddress { 192.168.36.200 } }3) Beide Maschinen müssen über ein Nginx-Prozessprüfungsskript verfügen und Nginx neu starten, wenn kein Prozess erkannt wird. Wenn es nicht neu gestartet werden kann, fahren Sie Keepalived herunter, damit VIP zur Backup-Maschine wechseln kann.
vi /etc/keepalived/chk_nginx.sh
#!/bin/sh #description: # 如果启动失败,则停止keepalived status=$( ps -C nginx --no-heading| wc -l) if [ "${status}" = "0" ]; then /usr/local/nginx/sbin/nginx status2=$( ps -C nginx --no-heading| wc -l) if [ "${status2}" = "0" ]; then service keepalived stop fi fiAusführungsberechtigungen festlegen: chmod +x /etc/keepalived/chk_nginx.sh
3. Starten und testen
Starten Sie nginx bzw. keepalived : /usr/local/nginx/sbin/nginx
Service Keepalived Start
Besuch:
web1
http://192.168.36.100:88/
http://192.168.36.200:88/
web2
http://192.168.36.100:99/
http://192.168.36.200:99/
kann normal aufgerufen werden.
Wir können versuchen, ein Keepalived auszuschalten. Schließen Sie keepalived
Service keepalived stop192.168.36.86 🎜 >
Protokoll anzeigen:
tail -f /var/log/messages
192.168.36.86 Protokoll:
Feb 7 00:39:05 slave-d Keepalived[5738]: Stopping Keepalived v1.2.15 (02/07,2015) Feb 7 00:39:05 slave-d Keepalived_vrrp[5741]: VRRP_Instance(VI_2) sending 0 priority Feb 7 00:39:05 slave-d Keepalived_vrrp[5741]: VRRP_Instance(VI_2) removing protocol VIPs. Feb 7 00:39:05 slave-d Keepalived_healthcheckers[5740]: Netlink reflector reports IP 192.168.36.200 removed Feb 7 00:39:05 slave-d avahi-daemon[1823]: Withdrawing address record for 192.168.36.200 on eth0.192.168.36.99 Protokoll:
Feb 7 00:39:11 slave-c Keepalived_vrrp[25103]: VRRP_Instance(VI_2) Transition to MASTER STATE Feb 7 00:39:12 slave-c Keepalived_vrrp[25103]: VRRP_Instance(VI_2) Entering MASTER STATE Feb 7 00:39:12 slave-c Keepalived_vrrp[25103]: VRRP_Instance(VI_2) setting protocol VIPs. Feb 7 00:39:12 slave-c Keepalived_healthcheckers[25102]: Netlink reflector reports IP 192.168.36.200 added Feb 7 00:39:12 slave-c avahi-daemon[1832]: Registering new address record for 192.168.36.200 on eth0.IPv4. Feb 7 00:39:12 slave-c Keepalived_vrrp[25103]: VRRP_Instance(VI_2) Sending gratuitous ARPs on eth0 for 192.168.36.200 Feb 7 00:39:17 slave-c Keepalived_vrrp[25103]: VRRP_Instance(VI_2) Sending gratuitous ARPs on eth0 for 192.168.36.200Neustart auf 192.168.36.86 keepalived:
192.168.36.86 Protokoll:
Feb 7 00:40:42 slave-d Keepalived[6004]: Starting Keepalived v1.2.15 (02/07,2015) Feb 7 00:40:42 slave-d Keepalived[6005]: Starting Healthcheck child process, pid=6007 Feb 7 00:40:42 slave-d Keepalived[6005]: Starting VRRP child process, pid=6008 Feb 7 00:40:42 slave-d Keepalived_vrrp[6008]: Netlink reflector reports IP 192.168.36.86 added Feb 7 00:40:42 slave-d Keepalived_vrrp[6008]: Netlink reflector reports IP fe80::20c:29ff:fe6a:66ff added Feb 7 00:40:42 slave-d Keepalived_vrrp[6008]: Registering Kernel netlink reflector Feb 7 00:40:42 slave-d Keepalived_vrrp[6008]: Registering Kernel netlink command channel Feb 7 00:40:42 slave-d Keepalived_vrrp[6008]: Registering gratuitous ARP shared channel Feb 7 00:40:42 slave-d Keepalived_vrrp[6008]: Opening file '/etc/keepalived/keepalived.conf'. Feb 7 00:40:42 slave-d Keepalived_healthcheckers[6007]: Netlink reflector reports IP 192.168.36.86 added Feb 7 00:40:42 slave-d Keepalived_healthcheckers[6007]: Netlink reflector reports IP fe80::20c:29ff:fe6a:66ff added Feb 7 00:40:42 slave-d Keepalived_healthcheckers[6007]: Registering Kernel netlink reflector Feb 7 00:40:42 slave-d Keepalived_healthcheckers[6007]: Registering Kernel netlink command channel Feb 7 00:40:42 slave-d Keepalived_healthcheckers[6007]: Opening file '/etc/keepalived/keepalived.conf'. Feb 7 00:40:42 slave-d Keepalived_vrrp[6008]: Configuration is using : 44182 Bytes Feb 7 00:40:42 slave-d Keepalived_vrrp[6008]: Using LinkWatch kernel netlink reflector... Feb 7 00:40:42 slave-d Keepalived_vrrp[6008]: VRRP_Instance(VI_1) Entering BACKUP STATE Feb 7 00:40:42 slave-d Keepalived_vrrp[6008]: VRRP sockpool: [ifindex(2), proto(112), unicast(0), fd(10,11)] Feb 7 00:40:42 slave-d Keepalived_healthcheckers[6007]: Configuration is using : 7257 Bytes Feb 7 00:40:42 slave-d Keepalived_healthcheckers[6007]: Using LinkWatch kernel netlink reflector... Feb 7 00:40:42 slave-d Keepalived_vrrp[6008]: VRRP_Instance(VI_2) Transition to MASTER STATE Feb 7 00:40:42 slave-d Keepalived_vrrp[6008]: VRRP_Instance(VI_2) Received lower prio advert, forcing new election Feb 7 00:40:43 slave-d Keepalived_vrrp[6008]: VRRP_Instance(VI_2) Entering MASTER STATE Feb 7 00:40:43 slave-d Keepalived_vrrp[6008]: VRRP_Instance(VI_2) setting protocol VIPs. Feb 7 00:40:43 slave-d avahi-daemon[1823]: Registering new address record for 192.168.36.200 on eth0.IPv4. Feb 7 00:40:43 slave-d Keepalived_vrrp[6008]: VRRP_Instance(VI_2) Sending gratuitous ARPs on eth0 for 192.168.36.200 Feb 7 00:40:43 slave-d Keepalived_healthcheckers[6007]: Netlink reflector reports IP 192.168.36.200 added Feb 7 00:40:48 slave-d Keepalived_vrrp[6008]: VRRP_Instance(VI_2) Sending gratuitous ARPs on eth0 for 192.168.36.200192.168.36.99 Protokoll:
Feb 7 00:40:47 slave-c Keepalived_vrrp[25103]: VRRP_Instance(VI_2) Received higher prio advert Feb 7 00:40:47 slave-c Keepalived_vrrp[25103]: VRRP_Instance(VI_2) Entering BACKUP STATE Feb 7 00:40:47 slave-c Keepalived_vrrp[25103]: VRRP_Instance(VI_2) removing protocol VIPs. Feb 7 00:40:47 slave-c Keepalived_healthcheckers[25102]: Netlink reflector reports IP 192.168.36.200 removed Feb 7 00:40:47 slave-c avahi-daemon[1832]: Withdrawing address record for 192.168.36.200 on eth0.Sie können darauf weiterhin normal zugreifen, nachdem Sie es geschlossen haben.
Nach dem Schließen von Nginx können Sie sehen, dass Nginx sofort startet.
Referenzartikel:
CentOS6.5 Keepalived detaillierte Erklärung und Implementierung der Hochverfügbarkeit des Nginx-Dienstes
Verwenden Sie NginX+keepalived, um einen Hochverfügbarkeits-Lastausgleich zu erreichen
Keepalived+Nginx, um einen Hochverfügbarkeits- und Dual-Master-Knoten-Lastausgleich zu erreichen
nginx+keepalived realisiert Nginx Dual-Master-Hochverfügbarkeits-Lastausgleich