HAproxy load balancer;
Use it because of simply doing HTTP protocol load; at the same time can protect server-side service is not exposed to the IP network.
yum install haproxy -y
HAproxy configuration example;
haproxy arranged into five levels:
Global : Global
Listen: Frontend and Backend combination of
defaults: configure the default parameters
frontend: in response to a front end configuration
backend: backend server cluster configuration
Configuration file example:
vi /etc/haproxy/haproxy.cfg # global # to have these messages end up in /var/log/haproxy.log you will # need to: # # 1) configure syslog to accept network log events. This is done # by adding the '-r' option to the SYSLOGD_OPTIONS in # /etc/sysconfig/syslog # # 2) configure local2 events to go to the /var/log/haproxy.log # file. A line like the following can be added to # /etc/sysconfig/the syslog # # local2. * / var / log / haproxy.log # log 127.0 . 0.1 local2 CHROOT / var / lib / HAProxy PidFile / var / RUN / haproxy.pid nbproc . 4 # number of threads The maxconn 5000 # maximum number of connections User HAProxy Group haproxy # user group daemon # be run as a daemon # Turn ON UNIX socket stats stats socket / var / lib / HAProxy / stats # Defaults http module default mode http # log global # log using global configuration module defined in option httplog # log category option dontlognull # HAProxy not ensure the recording state for detecting the upper load balancing over the transmission of heartbeat data packet without Option http -server- Close # when the high server load time, automatically off the end of the current queue processing relatively long link option forwardfor the except 127.0 . 0.0 / 8 # set the back-end address option after redispatch # serverId corresponding server hang, forcing directed to other healthy server retries 3 # retries timeout HTTP - request 10s # HTTP request timeout timeout queue 1m # default queue timeout timeout connect 10s # successfully connected to a server maximum wait time timeout http timeout client 1m # connection client maximum wait time timeout server 1m # server response to client maximum wait time-keep- Alive # 10s long connection timeout timeout check 10s # heartbeat timeout maxconn 3000 # maximum number of connections # set a static page to monitor the listen stats the MODE HTTP the bind 0.0 . 0.0 : 2019 # monitor stats enable # stats hide - Version # hidden version stats uri ?? / haproxyadmin stats # HAProxy state management page, by / HAProxy stats to access stats realm Haproxy \ statistics # statistics state stats auth admin: admin # set the monitoring page of the user and password stats ADMIN IF TRUE # load configuration frontend http the bind *: the MODE HTTP2020 log Global Option httpclose Option logasap Option dontlognull Capture Request header len the Host 20 is Capture the Referer len Request header 60 default_backend Servers http_back # define a server group # backend configuration backend Servers Balance of the RoundRobin # Polling Server server1 172.16.2.40:80 The maxconn 2000 Check Server server2 172.16.2.41:80 the check maxconn 2000 back-end service marks of distinction ip: port maximum number of connections maxconn the check key inter health check interval 2000 milliseconds rise detected as a normal number of fall detection for the number of failed weight weights
HAProxy load balancing algorithms:
roundrobin # Polling static - RR # WRR leastconn # minimum number of connections source # corresponds to nginx ip_hash HDR (name) # lock up every HTTP request HTTP request uri # requested according to the URI url_param # according to the request URl parameters ' Balance url_param ' The requires the URL of the parameter name AN RDP -cookie (name) # represents the (name) lock according to data hash cookie and every TCP request
Detection page visit http: // ip: 2019; front password admin: admin
