Tomcat集群session复制,httpd/nginx反代Tomcat集群
一个大型站点都会涉及到动态应用，动态应用都需要做会话保持，常见的会话保持方式就三种，一是session stick，二是session replication，三是session share，对于小型规模的tomcat集群，大多者会采用session replication方式，但阅读官方文档也好，查询大牛博客也罢，发现均有不准确之处，所以亲测成功实现之后得出如下文档，还望高人指点。实验环境：
操作系统：CentOS 7.2
tomcat版本：tomcat-7.0.54（yum安装方式）
httpd版本：httpd-2.4.6（yum安装方式）
nginx版本：nginx-1.10.2（yum安装方式）
iptables状态：disable
SELinux状态：disable
TomcatA配置过程
# ifconfig
eno16777736:flags=4163mtu 1500
inet 192.168.0.20netmask255.255.255.0broadcast 192.168.0.255
inet6 fe80::20c:29ff:fefe:64f3 prefixlen 64scopeid0x20
ether 00:0c:29:fe:64:f3 txqueuelen 1000(Ethernet)
RX packets 1147bytes 141324(138.0 KiB)
RX errors 0dropped 0overruns 0 frame 0
TX packets 659bytes 102242 (99.8KiB)
TX errors 0dropped 0 overruns0carrier 0collisions 0
lo:flags=73mtu65536
inet 127.0.0.1netmask 255.0.0.0
inet6 ::1prefixlen 128scopeid 0x10
looptxqueuelen 0(Local Loopback)
RX packets 0bytes 0 (0.0 B)
RX errors 0dropped 0overruns 0 frame 0
TX packets 0bytes 0 (0.0 B)
TX errors 0dropped 0 overruns0carrier 0collisions 0
# cat/etc/yum.repos.d/hehe.repo
name=cdrom-repo
baseurl=file:///cdrom
gpgcheck=0
name=aliyun-epel
baseurl=http://mirrors.aliyun.com/epel/7/x86_64/
gpgcheck=0
#
# yum install -y tomcat
# mkdir -pv/usr/share/tomcat/webapps/ROOT/WEB-INF
mkdir: created directory‘/usr/share/tomcat/webapps/ROOT’
mkdir: created directory‘/usr/share/tomcat/webapps/ROOT/WEB-INF’
# vim/usr/share/tomcat/webapps/ROOT/index.jsp
# cat/usr/share/tomcat/webapps/ROOT/index.jsp
TomcatA
TomcatA
SessionID
Createdon
# scp/usr/share/tomcat/webapps/ROOT/index.jsp 192.168.0.21:/usr/share/tomcat/webapps/ROOT/
The authenticity of host '192.168.0.21(192.168.0.21)' can't be established.
ECDSA key fingerprint isfc:7f:15:2b:2d:69:c9:c1:b0:79:7c:ce:ab:c0:0c:36.
Are you sure you want to continueconnecting (yes/no)? yes
Warning: Permanently added '192.168.0.21'(ECDSA) to the list of known hosts.
root@192.168.0.21's password:
index.jsp 100%410 0.4KB/s00:00
# ss -tnl
State Recv-Q Send-Q LocalAddress:Port Peer Address:Port
LISTEN 0 128 *:22 *:*
LISTEN 0 128 :::22 :::*
# systemctl start tomcat
# ss -tnl
State Recv-Q Send-Q LocalAddress:Port Peer Address:Port
LISTEN 0 128 *:22 *:*
LISTEN 0 100 :::8009 :::*
LISTEN 0 100 :::8080 :::*
LISTEN 0 128 :::22 :::*
#
TomcatB环境配置
# ifconfig
eno16777736:flags=4163mtu 1500
inet 192.168.0.21netmask255.255.255.0broadcast 192.168.0.255
inet6 fe80::20c:29ff:fed8:be3b prefixlen 64scopeid0x20
ether 00:0c:29:d8:be:3b txqueuelen 1000(Ethernet)
RX packets 839bytes 107014(104.5 KiB)
RX errors 0dropped 0overruns 0 frame 0
TX packets 430bytes 68356 (66.7KiB)
TX errors 0dropped 0 overruns0carrier 0collisions 0
lo: flags=73mtu 65536
inet 127.0.0.1netmask 255.0.0.0
inet6 ::1prefixlen 128scopeid 0x10
looptxqueuelen 0(Local Loopback)
RX packets 0bytes 0 (0.0 B)
RX errors 0dropped 0overruns 0 frame 0
TX packets 0bytes 0 (0.0 B)
TX errors 0dropped 0 overruns0carrier 0collisions 0
# cat/etc/yum.repos.d/hehe.repo
name=cdrom-repo
baseurl=file:///cdrom
gpgcheck=0
name=aliyun-epel
baseurl=http://mirrors.aliyun.com/epel/7/x86_64/
gpgcheck=0
#
# yum install -y tomcat
# mkdir -pv/usr/share/tomcat/webapps/ROOT/WEB-INF
mkdir: created directory‘/usr/share/tomcat/webapps/ROOT’
mkdir: created directory‘/usr/share/tomcat/webapps/ROOT/WEB-INF’
# vim/usr/share/tomcat/webapps/ROOT/index.jsp
# cat/usr/share/tomcat/webapps/ROOT/index.jsp
TomcatB
TomcatB
SessionID
Createdon
# ss -tnl
State Recv-Q Send-Q LocalAddress:Port Peer Address:Port
LISTEN 0 128 *:22 *:*
LISTEN 0 128 :::22 :::*
# systemctl start tomcat
# ss -tnl
State Recv-Q Send-Q LocalAddress:Port Peer Address:Port
LISTEN 0 128 *:22 *:*
LISTEN 0 100 :::8009 :::*
LISTEN 0 100 :::8080 :::*
LISTEN 0 128 :::22 :::*
#
测试两台tomcat服务器工作是否正常
使用浏览器访问结果如图所示
https://s2.运维网.com/wyfs02/M02/07/7F/wKiom1nKdbqxI2YdAABe31CUYgU459.png
https://s2.运维网.com/wyfs02/M01/07/7F/wKiom1nKdbqwIcJRAABfWgLUfmE526.png
接下来就需要配置前端的反代服务器，以及tomcat集群session复制了
httpd反代tomcat集群配置
在这里我们为了节约资源就把httpd反代服务器配置到TomcatA服务器上
# yum install -y httpd
# vim/etc/httpd/conf.d/httpd_tomcat.conf
# cat/etc/httpd/conf.d/httpd_tomcat.conf
#LoadModule proxy_modulemodules/mod_proxy.so
#LoadModule proxy_ajp_modulemodules/mod_proxy_ajp.so
#LoadModule proxy_balancer_modulemodules/mod_proxy_balancer.so
BalancerMemberajp://192.168.0.20:8009 route=TomcatA loadfactor=1
BalancerMemberajp://192.168.0.21:8009 route=TomcatB loadfactor=1
ProxySetlbmethod=byrequests
#ProxySetstickysession=JSESSIONID
ServerNameproxy.test.com
ProxyViaOn
ProxyRequestsOff
ProxyPreserveHostOn
Requireall granted
ProxyPass/ balancer://tomcatcluster/
ProxyPa***everse/ balancer://tomcatcluster/
Requireall granted
SetHandlerbalancer-manager
ProxyPass!
Requireall granted
# vim/etc/httpd/conf/httpd.conf
修改如下内容
ServerName www.example.com:80
DirectoryIndex index.jsp
# httpd -t
Syntax OK
# cp/etc/tomcat/server.xml{,.bak}
# vim/etc/tomcat/server.xml
默认配置文件需要修改以下几个地方
Engine标签下添加集群配置内容
修改日志格式为httpd combined格式
# mv/etc/tomcat/server.xml{,.bak}
# scp/etc/tomcat/server.xml 192.168.0.21:/etc/tomcat/
root@192.168.0.21's password:
server.xml 100% 8226 8.0KB/s 00:00
#
对比TomcatA需要修改的地方
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