Heartbeat-based unicast for Tomcat high availability

1. Node planning

Add eth0, eth1 two NIC on Master, backup node, add process, refer to "VMware-based CentOS 6.5 configuration two network card"

2. IP planning

 	master	backup
eth0	192.168.46.128	Span style= "font-family: Song body; font-size:16px ">192.168.46.130
eth1	192.168.46.129	Span style= "font-family: Song body; font-size:16px ">192.168.46.131

The above table shows that the IP of the ETH0 network card in the master node is the IP of the 192.168.46.128,ETH1 network card is the 192.168.46.129;backup node eth0 the IP of the network card is 192.168.46.130,eth1 NIC IP is 192.168.4 6.131

3, VIP Planning (virtual IP planning)

IP Address	Subnet mask	Description
192.168.46.150	255.255.255.0	192.168.46.150/24

192.168.46.150/24 is equivalent to IP is 192.168.46.150, subnet mask is 255.255.255.0

3. Network Card Planning

 	master	backup
eth0	data nic	data network card
eth1	heartbeat network	heartbeat network

4, software planning

software	version
heartbeat	3.0.4	automatically installed with Yum
tomcat	7.0.70	requires manual configuration

5. Directory Planning

Software	Directory
tomcat-7.0.70	/etc/server

6. Install Tomcat

The following is an example of configuring the master node

1, create the/etc/server directory, and switch to the directory, as follows

2. Get apache-tomcat-7.0.70.tar.gz connection (http://mirror.bit.edu.cn/apache/tomcat/tomcat-7/v7.0.70/bin/apache-tomcat-7.0.70.tar.gz)

3, use wget download, as follows

4, decompression apache-tomcat-7.0.70.tar.gz

5. Delete apache-tomcat-7.0.70.tar.gz and rename Tomcat

6. Same configuration on the backup node

7. Check if Tomcat on the two nodes can be accessed normally

7, installation Heartbeat

On the master node, enter "Yum install heartbeat-y" and install Heartbeat

In executing the above sentence, the following error may be reported

Workaround

1. Use the Yum list heartbeat to see if there are heartbeat in the source, as follows

2, appear above problem no matching Packages to list, may be the source is not heartbeat, by default, the system comes with the source, but the source is not heartbeat, as follows

3, can add Epel, to solve the problem, please refer to "Add Epel source for centos6.5 system"

operation on the backup node as well

8, configuration Heartbeat

1, heartbeat configuration file is in the/ETC/HA.D directory, by default, Haresources, Authkeys, ha.cf files in this directory is not, need to from/usr/share/doc/heartbeat-3.0.4/ Copy, the following is an example of operating on the master node, as follows

operation on the backup node as well

2. Configuring the Ha.cf File

The contents of the ha.cf file on the master node are as follows

debugfile/var/log/ha-debuglogfile/var/log/ha-log# specifies that the heartbeat interval is 2 seconds keepalive, specifies that if the standby node does not receive the heartbeat information number of the master node within 30 seconds, Immediately takes over the service resource of the primary node Deadtime 30# specifies a heartbeat delay of 10 seconds, and 10 seconds when the node cannot receive a heartbeat signal from the primary node, it writes a warning to the log, # but does not take over the service at this time. Until more than Deadtime still can't receive the heartbeat again take over warntime 10# initialization time is 120 seconds initdead 120udpport 694# Use network card eth1 to send heartbeat, the IP address should be the other IP address ucast eth1 192.168.46.129# If the primary node is restored, the master node will preempt the resource, and if it is off, the master node retrieves the resource Auto_failback on# the primary node name, and the uname-n display must be consistent with the node master. # The node noun must be consistent with the Uname-n display, node backup# in the standby node can not receive the primary node's heartbeat, ping the ping server first, will determine whether the network has problems ping 192.168.46.2

the ha.cf file on the backup node is essentially the same as in Mater, with the following differences

Ucast eth1 192.168.46.131

other configurations are the same as in master and are no longer given here

 3, configuration Authkeys

Because the communication between the machine needs authentication, so need to configure the authentication file Authkeys, optional authentication has CRC, SHA1, MD5, here we choose CRC, not encryption authentication

Auth CRC

The Authkeys configuration in master and the backup node is the same as above

Note that there is a need to modify the Authkeys permissions to 600, as follows

4, Configuration Haresources

Master Ipaddr::192.168.46.150/24/eth0 Tomcat

The contents of the Haresources file in the master and backup nodes are the same as shown above

Parameter explanation:

Master is the host name, which will be tied to the VIP at startup

IPAddr is a script that comes with heartbeat, and then the IP is the parameters of the script.

192.168.46.150/24/eth0 This sentence means: When initializing, on the master host's ETH0 network adapter bound virtual IP (192.168.46.150), the subnet mask is 255.255.255.0

Tomcat is a script that can start and stop Tomcat by passing the Start/stop parameter, if there is more than one service to host to heartbeat, just use a space to separate it and add it later; If the service you want to host needs to take a different virtual IP, you have to configure it on a single line.

5. Write the Tomcat start-stop script

The script must be in the/ETC/INID.D or/ETC/HA.D/RESOURCE.D directory, and the script name is Tomcat, where we put it in the/ETC/HA.D/RESOURCE.D directory, as an example in the master node operation, as follows

Case $ instart)/etc/server/tomcat/bin/startup.sh;; stop)/etc/server/tomcat/bin/shutdown.sh;; *) echo "param (start|stop)" Exit 1;; Esacexit 0

Add executable permissions for the Tomcat script, as follows

9. Start Heartbeat

Enter "/etc/init.d/heartbeat start" on master, backup node respectively, start heartbeat

10, the implementation effect is as follows

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Heartbeat-based unicast for Tomcat high availability