使用HAProxy作为MongoDB分片集群mongos负载均衡
MongoDB分片集群的入口mongos自身没有failover机制。官方建议是将mongos和应用服务器部署在一起，多个应用服务器就要部署多个mongos实例，这样很是不方便。还可以使用LVS或者HAProxy来实现多个mongos的failover机制，但是一定要注意使用client affinity即客户端关联特性。1
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global
chroot /data/app_platform/haproxy/share/
log 127.0.0.1 local3 info
daemon
user haproxy
group haproxy
pidfile /var/run/haproxy.pid
nbproc 1
stats socket/tmp/haproxy level admin
stats maxconn 20
node master_loadbalance1
description lb1
maxconn 65536
nosplice
spread-checks 3
defaults
log global
mode tcp
option abortonclose
option allbackups
option tcpka
option redispatch
retries 3
timeout check 60s
timeout connect 600s
timeout queue 600s
timeout server 600s
timeout tarpit 60s
timeout client 600s
frontendmongos_pool 0.0.0.0:28018
mode tcp
maxconn 32768
no option dontlognull
option tcplog
log global
option log-separate-errors
default_backend mongos_pool
backend mongos_pool
mode tcp
balance source
default-server inter 2s fastinter 1s downinter 5s slowstart 60s rise 2 fall 5 weight 30
servergintama-xxx-mongos1 192.168.100.74:28018 checkmaxconn 2000
servergintama-xxx-mongos2 192.168.100.75:28018 checkmaxconn 2000
注意使用
balance source
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