Heartbeat dual-host hot standby service setup on Linux

Article Title: heartbeat dual-host hot standby service setup on Linux. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source.

[1] environment setting before installation

Hardware environment of the two hosts (not completely consistent ):

CPU: Xeon 3G * 2 (EM64T)

MEM: 2G

NIC: Intel 1G * 2

Eth0: external IP address

Eth1: internal IP address (for HA)

The eth1 of the two hosts are directly connected through dual-host couplets.

Partitioning Method:

Filesystem capacity mount point

/Dev/sda2 9.7G/

/Dev/sda6 45G/Datas

/Dev/sda1 99 M/boot

None2.0G/dev/shm

/Dev/sda3 9.7G/opt

In addition, each host should reserve MB of raw space or use it as a shared space for HA.

Operating System:

RedHat Enterprise 4 Update2 (2.6.9-22 EL)

Pre-installed software:

@ X Window System

@ GNOME Desktop Environment

@ KDE Desktop Environment

@ Editors

@ Engineering and Scientific

@ Graphical Internet

@ Text-based Internet

@ Authoring and Publishing

@ Server Configuration Tools

@ Development Tools

@ Kernel Development

@ X Software Development

@ GNOME Software Development

@ KDE Software Development

@ Adminitools

@ System Tools

[2] network environment settings before installation:

Node1: Host Name: servers201 (HA01)

Eth0: 192.168.10.201 // external IP address

Eth1: 10.0.0.201 // HA heartbeat address

Node2: Host Name: servers202 (HA02)

Eth0: 192.168.10.202 // external IP address

Eth1: 10.0.0.202 // HA heartbeat address

Check the following files:

/Etc/hosts

/Etc/host. conf

/Etc/resolv. conf

/Etc/sysconfig/network

/Etc/sysconfig/network-scripts/ifcfg-eth0

/Etc/sysconfig/network-scripts/ifcfg-eth1

/Etc/nsswitch. conf

# Vi/etc/hosts

The hosts content of node1 is as follows:

127.0.0.1 localhost. localdomain localhost

192.168.10.201 servers201 HA01

10.0.0.201 HA01

10.0.0.202 HA02

192.168.10.202 server202

The hosts content of node2 is as follows:

127.0.0.1 localhost. localdomain localhost

192.168.10.202 servers202 HA02

10.0.0.202 HA02

10.0.0.201 HA01

192.168.10.201 server201

# Cat/etc/host. conf

Order hosts, bind

# Cat/etc/resolv. conf

Nameserver 61.139.2.69 // DNS address

# Cat/etc/sysconfig/network

NETWORKING = yes

HOSTNAME = servers201 // host name

GATEWAY = "192.168.10.1" // GATEWAY

GATEWAY = "eth0" // The network card used by the GATEWAY

ONBOOT = YES // load at startup

FORWARD_IPV4 = "yes" // only IPV4 addresses are allowed

# Cat/etc/sysconfig/network-scripts/ifcfg-eth0

DEVICE = eth0

ONBOOT = yes

BOOTPROTO = static

IPADDR = 192.168.10.201

NETMASK = 255.255.255.0

GATEWAY = 192.168.10.1

TYPE = Ethernet

IPV6INIT = no

# Cat/etc/sysconfig/network-scripts/ifcfg-eth1

DEVICE = eth1

ONBOOT = yes

BOOTPROTO = none

IPADDR = 10.0.0.201

NETMASK = 255.255.255.0

TYPE = Ethernet

[Node1] and [node2] in the preceding configuration,

/Etc/hosts

/Etc/sysconfig/network

/Etc/sysconfig/network-scripts/ifcfg-eth0

/Etc/sysconfig/network-scripts/ifcfg-eth1

Except for modification.

After the configuration is complete, try to ping the Host Name of the other host. You can ping the Host Name of the other host:

/Root # ping HA02

PING HA02 (10.0.0.202) 56 (84) bytes of data.

64 bytes from HA02 (10.0.0.202): icmp_seq = 0 ttl = 64 time = 0.198 MS

64 bytes from HA02 (10.0.0.202): icmp_seq = 1 ttl = 64 time = 0.266 MS

64 bytes from HA02 (10.0.0.202): icmp_seq = 2 ttl = 64 time = 0.148 MS

--- HA02 ping statistics ---

3 packets transmitted, 3 bytes ed, 0% packet loss, time 2002 ms

Rtt min/avg/max/mdev = 0.148/0.204/0.266/0.048 MS, pipe 2

[3] install the HA and HA dependency packages

Rpm-Uvh libnet-1.1.2.1-1.rh.el.um.1.i386.rpm // can be left empty

Rpm-Uvh heartbeat-pils-2.0.4-1.el4.i386.rpm

Rpm-Uvh heartbeat-stonith-2.0.4-1.el4.i386.rpm

Rpm-Uvh heartbeat-2.0.4-1.el4.i386.rpm

Rpm-Uvh ipvsadm-1.24-5.i386.rpm

[4] configuration files for configuring HA

Configure the heartbeat encryption method: authkeys

# Vi/etc/ha. d/authkeys

If you use dual-host couplet wires (twisted pair wires), you can configure the following:

# Vi/etc/hc. d/authkeys

Auth 1

1 crc

Save the disk and exit, and then

# Chmod 600 authkeys

Configure heartbeat monitoring: haresources

# Vi/etc/ha. d/haresources

All hosts should be identical.

Server201 IPaddr: 192.168.10.200 ipvsadm httpd

Specify server201 to call ipvsadm to start the http service. The system attaches a virtual IP address 192.168.10.200 to eth0: 0.

If server201 is down, server202 can automatically start the http service and assign the IP address 192.168.10.200 to the eth0: 0 of server202.

Configure the heartbeat configuration file: ha. cf

# Vi/etc/ha. d/ha. cf

Logfile/var/log/ha_log/ha-log.log # the location where the ha log file is recorded. If the directory does not exist, manually add

Bcast eth1 # Use eth1 for heartbeat monitoring

Keepalive 2 # Set the heartbeat (Monitoring) Time to 2 seconds

Warntime 10

Deadtime 30

Initdead 120

Hopfudge 1

Udpport 694 # Use udp port 694 for heartbeat monitoring

Auto_failback on

Node server201 # node 1, which must be consistent with the result obtained by the uname-n command.

Node server202 # node 2

Ping 192.168.10.1 # ping the gateway to check whether the heartbeat is normal.

Respawn hacluster/usr/lib64/heartbeat/ipfail

Apiauth ipfail gid = root uid = root

Debugfile/Datas/logs/ha_log/ha-debug.log

Configure ingress SADM monitoring

Ipvsadm-A-t 192.168.10.200: 80-s rr

Ipvsadm-a-t 192.168.10.200: 80-r 192.168.10.201: 80-m

Ipvsadm-a-t 192.168.10.200: 80-r 192.168.10.202: 80-m

Perform monitoring after execution:

# Ipvsadm -- list

If the returned result is the same as the following, the setting is correct.

IP Virtual Server version 1.2.0 (size = 4096)

Prot LocalAddress: Port sched1_flags

-> RemoteAddress: Port Forward Weight ActiveConn InActConn

TCP 192.168.10.200: http rr

-> Server202: http Local 1 0 0

-> Server201: http Masq 1 0 0

[5] startup, shutdown, and testing of the HA Service

Start HA: service heartbeat start

Disable HA; service heartbeat stop

The system automatically loads heartbeat at startup.

Use http service to test heartbeat

Start the httpd service

# Service httpd start

Edit the html file used for testing on the respective hosts and put it in the/var/www/html/directory.

Start heartbeat of node1 and execute this command for monitoring: heartbeat status

[6] firewall settings

Heartbeat uses udp port 694 by default for heartbeat monitoring. If the system uses iptables for firewall, remember to open this port.

# Vi/etc/sysconfig/iptables

Add the following content

-A RH-Firewall-1-INPUT-p udp-m udp -- dport 694-d 10.0.0.201-j ACCEPT

This means that udp port 694 is open to the peer's heartbeat NIC address 10.0.0.201.

# Service iptables restart

Reload iptables.