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Haproxy web cluster deployment

HAProxy provides high availability, load balancing, agents based on TCP and HTTP applications, and supports virtual hosts. It is a free, fast and reliable solution. HAProxy is especially suitable for heavily loaded web sites, which usually require session persistence or seven layers of processing. HAProxy implements a single-process model that supports a very large number of concurrent connections with multiple processes or multithreaded models that are limited by memory, system schedulers, and ubiquitous locks, and rarely handle thousands of concurrent connections.

Deployment environment:

Mainframe

IP address

Hostnam

Software

Operating system

Haproxy server

192.168.1.10

Haproxy

Haproxy-1.4.24

Centos-6.5

Nginx1 server

192.168.1.20

Nginx1

Nginx-1.6.2

Centos-6.5

Nginx2 server

192.168.1.30

Nginx2

Nginx-1.6.2

Centos-6.5

Client

192.168.1.40

Khj

IE browser

Centos-6.5

Compile, install, test nginx

Modify the ip address to remove the yum repository, and set up a new local yum repository below to create nginx package storage files

Mount the nginx CD cp to / nginx

Build a local yum warehouse

Yum file nginx.repo content:

Enter the / nginx directory to create a nginx user name for the tar nginx package

Compile and install nginx

Set up a test nginx page, start the nginx service, and see if the nginx port is started

Set iptables firewall policy to allow port 80 to pass through

Note: configuring the nginx1 server is the same as the nginx2 configuration above. You can follow the steps above.

Use the client to access two nginx servers

Compile and install haproxy

Set up a local yum repository to install haproxy dependency packages

Tar haproxy package, compiling and installing

TARGET=linux26 stands for 64-bit operating system

Establish a haproxy profile

Configuration haproxy server file configuration file is mainly divided into global global configuration, defaults default configuration, listen application component configuration.

Configure haproxy files, create self-startup scripts, set up soft connections

The haproxy.cfg configuration file is as follows:

Global

Log 127.0.0.1 local0 configures logging. Local0 is a logging device and is stored in the system log by default.

Log 127.0.0.1 local1 notice notice is the log level, usually 24 levels

# log loghost local0 info

Maxconn 4096 maximum number of connections

# chroot / usr/share/haproxy

Uid 99 user uid

Gid 99 user uid

Daemon

# debug

# quiet

Defaults

Log global definition logs are defined for logs in the globel configuration

Mode http mode is http

Option httplog records logs in http log format

Option dontlognull

Retries 3 checks the number of node failures, reaching three failures in a row, and will consider the node unavailable

Maxconn 2000 maximum number of connections

Contimeout 5000 connection timeout

Clitimeout 50000 client timeout

Srvtimeout 50000 server timeout

Option httpclose

Listen webcluster 0.0.0.0 80 defines a webcluster application

Option httpchk GET / index.html checks the server's index.html

Balance roundrobin load balancing scheduling algorithm using polling algorithm

Online node defined by server inst1 192.168.1.20 fall 80 check inter 2000 fall 3

Server inst2 192.168.1.30 fall 80 check inter 2000 fall 3 becomes a backup node if you add bachak after it

Start the haproxy service, turn off the firewall, or configure policy

Test whether the web cluster achieves high performance and high availability on the client (disable nginx1)

Configure haproxy Lo

The log of Haproxy is saved to the syslog of the system by default, which is not convenient to view, so we can store the log in different files separately in the production environment. The configuration is as follows

First of all, modify the configuration file, mainly change the following part

Then modify the rsyslog configuration, define the haproxy-related configuration to haproxy.conf independently, and put it under / etc/rsyslog.d. When rsyslog starts, it will automatically load all configuration files in this directory.

The configuration is as follows:

If ($programname = = 'haproxy' and $syslogseverity-text = =' info') then-/ var/log/haproxy/haproxy-info.log

$~

If ($programname = = 'haproxy' and $syslogseverity-text = =' notice') then-/ var/log/haproxy/haproxy-notice.log

$~

Restart the rsyslog service and view haproxy access information

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