一:本文将详细介绍haproxy的配置使用以及高级功能的使用,比如通过haproxy进行动态添加删除负载集群中的后端web服务器的指定主机,另外将详细介绍keepalived的详细配置方法、配置实例及实现方式,具体如下:
1.1:通过haproxy动态增减web集群中的主机,打开haproxy的主机在线维护功能,主要原理是haproxy监听本地socket文件,mysql写localhost会查抄默认路径为/var/lib/mysql/mysql.socket文件,但是使用IP地址是使用的TCP协议访问,就不需要查找socket文件了,所以使用localhost连接本机MySQL和写127.0.0.1连接本机MySQL的实现方式是不一样的,haproxy配置socket文件路径:
1.1.1:haproxy配置文件添加socket配置信息如下:
[root@localhost ~]# cat /etc/haproxy/haproxy.cfg
global
maxconn 100000
chroot /usr/local/haproxy
uid 99
gid 99
daemon
nbproc 1
pidfile /usr/local/haproxy/logs/haproxy.pid
log 127.0.0.1 local0 info
stats socket /var/lib/haproxy/haproxy.sock mode 600 level admin #设置socket文件路径,权限为600级别为admin,还有其他级别,但是动态添加主机需要admin权限
1.1.2:创建保存socket文件的目录:
# mkdir /var/lib/haproxy
1.1.3:重启haproxy服务:
[root@localhost ~]# /etc/init.d/haproxy restart
Restarting haproxy (via systemctl): [ OK ]
1.1.4:验证haproxy的socket文件:
[root@localhost ~]# ll /var/lib/haproxy/
total 0
srw------- 1 root root 0 Dec 31 21:02 haproxy.socket
1.2:安装socat命令,socat是和socket通信的命令:
1.2.1:安装命令:
[root@localhost ~]# yum install socat
1.2.2:命令使用帮助:
[root@localhost ~]# echo "help" | socat stdio /var/lib/haproxy/haproxy.socket
Unknown command. Please enter one of the following commands only :
help : this message
prompt : toggle interactive mode with prompt
quit : disconnect
disable agent : disable agent checks (use ‘set server‘ instead)
disable health : disable health checks (use ‘set server‘ instead)
disable server : disable a server for maintenance (use ‘set server‘ instead)
enable agent : enable agent checks (use ‘set server‘ instead)
enable health : enable health checks (use ‘set server‘ instead)
enable server : enable a disabled server (use ‘set server‘ instead)
set maxconn server : change a server‘s maxconn setting
set server : change a server‘s state, weight or address
get weight : report a server‘s current weight
set weight : change a server‘s weight (deprecated)
disable frontend : temporarily disable specific frontend
enable frontend : re-enable specific frontend
set maxconn frontend : change a frontend‘s maxconn setting
show servers state [id]: dump volatile server information (for backend <id>)
show backend : list backends in the current running config
shutdown frontend : stop a specific frontend
clear table : remove an entry from a table
set table [id] : update or create a table entry‘s data
show table [id]: report table usage stats or dump this table‘s contents
show errors : report last request and response errors for each proxy
clear counters : clear max statistics counters (add ‘all‘ for all counters)
show info : report information about the running process
show stat : report counters for each proxy and server
show sess [id] : report the list of current sessions or dump this session
shutdown session : kill a specific session
shutdown sessions server : kill sessions on a server
show pools : report information about the memory pools usage
add acl : add acl entry
clear acl <id> : clear the content of this acl
del acl : delete acl entry
get acl : report the patterns matching a sample for an ACL
show acl [id] : report available acls or dump an acl‘s contents
add map : add map entry
clear map <id> : clear the content of this map
del map : delete map entry
get map : report the keys and values matching a sample for a map
set map : modify map entry
show map [id] : report available maps or dump a map‘s contents
show stat resolvers [id]: dumps counters from all resolvers section and
associated name servers
set maxconn global : change the per-process maxconn setting
set rate-limit : change a rate limiting value
set timeout : change a timeout setting
show env [var] : dump environment variables known to the process
show tls-keys [id|*]: show tls keys references or dump tls ticket keys when id specifie
1.2.3:查看haproxy的详细信息:
[root@localhost ~]# echo "show info" | socat stdio /var/lib/haproxy/haproxy.socket
Name: HAProxy
Version: 1.7.1
Release_date: 2016/12/13
Nbproc: 1
Process_num: 1
Pid: 20077
Uptime: 0d 0h04m49s
Uptime_sec: 289
Memmax_MB: 0
PoolAlloc_MB: 0
PoolUsed_MB: 0
PoolFailed: 0
Ulimit-n: 200034
Maxsock: 200034
Maxconn: 100000
Hard_maxconn: 100000
CurrConns: 0
CumConns: 3
CumReq: 3
MaxSslConns: 0
CurrSslConns: 0
CumSslConns: 0
Maxpipes: 0
PipesUsed: 0
PipesFree: 0
ConnRate: 0
ConnRateLimit: 0
MaxConnRate: 0
SessRate: 0
SessRateLimit: 0
MaxSessRate: 0
SslRate: 0
SslRateLimit: 0
MaxSslRate: 0
SslFrontendKeyRate: 0
SslFrontendMaxKeyRate: 0
SslFrontendSessionReuse_pct: 0
SslBackendKeyRate: 0
SslBackendMaxKeyRate: 0
SslCacheLookups: 0
SslCacheMisses: 0
CompressBpsIn: 0
CompressBpsOut: 0
CompressBpsRateLim: 0
ZlibMemUsage: 0
MaxZlibMemUsage: 0
Tasks: