IP FailOver Setup Using KeepAlived on CentOS

IP FailOver Setup Using KeepAlived on CentOS & Red Hat

1. Network Scenario: LB1 Server: 192.168.10.111 ( eth1 ) ...
2. Graphical representation of Fail over Setup:
3. Step 1 – Install Required Packages. ...
4. Step 2 – Install Keepalived. ...
5. Step 3 – Configure Keepalived on LB1. ...
6. Step 4 – Configure KeepAlived on LB2. ...
7. Step 5 – Start KeepAlived. ...
8. Step 6 – Check Virtual IPs.

1. How do I configure Keepalived in Linux?
2. What is Keepalived in Linux?
3. How do I create a floating IP address in Linux?
4. What is Keepalived service?
5. How do I configure Keepalived?
6. What port does Keepalived use?
7. How do I know if VRRP is working?
8. How do I stop Keepalived?
9. What is HAProxy in Linux?
10. How do I setup a floating IP?
11. How do I create a floating IP address?
12. What is difference between elastic IP and public IP?

How do I configure Keepalived in Linux?

A. 3. Install and Configure keepalived

1. Install keepalived. # yum install -y keepalived.
2. Configure keepalived. # vim /etc/keepalived/keepalived.conf. In the following configuration, there is a script to check the HAProxy processes. ...
3. Enable and start keepalived. # systemctl enable keepalived # systemctl start keepalived.

What is Keepalived in Linux?

Keepalived is a routing software written in C. The main goal of this project is to provide simple and robust facilities for loadbalancing and high-availability to Linux system and Linux based infrastructures. ... Keepalived frameworks can be used independently or all together to provide resilient infrastructures.

How do I create a floating IP address in Linux?

For example, with eth0 you can use the following command. Then edit the new alias interface. Add the same “:1” to the device name, enter a new parameter NM_CONTROLLED=no, replace the IP address with the floating IP and then remove the gateway line. Save the file and exit after these changes.

What is Keepalived service?

Keepalived is a piece of software which can be used to achieve high availability by assigning two or more nodes a virtual IP and monitoring those nodes, failing over when one goes down. Keepalived can do more, like load balancing and monitoring, but this tutorial focusses on a very simple setup, just IP failover.

How do I configure Keepalived?

How to Setup IP Failover with KeepAlived on Ubuntu & Debian

1. Step 1 – Install Required Packages. ...
2. Step 2 – Install Keepalived. ...
3. Step 3 – Setup Keepalived on LB1. ...
4. Step 4 – Setup KeepAlived on LB2. ...
5. Step 5 – Start KeepAlived Service. ...
6. Step 6 – Check Virtual IPs. ...
7. Step 7 – Verify IP Failover Setup.

What port does Keepalived use?

Keepalived will now use VRRP to elect an active node, which in turn will listen on the virtual_server IP and port, in this case the VRRP virtual IP and TCP port 25.

How do I know if VRRP is working?

To display a brief or detailed status of one or all Virtual Router Redundancy Protocol (VRRP) virtual routers, use the show vrrp command in EXEC mode.

How do I stop Keepalived?

For example, to stop keepalived running, execute: kill -s $(keepalived --signum=STOP) $(cat /var/run/keepalived. pid) Keepalived will check the configuration file and exit with non-zero exit status if there are errors in the configuration, otherwise it exits with exit status 0 (see Exit status below for details).

What is HAProxy in Linux?

HAProxy is free, open source software that provides a high availability load balancer and proxy server for TCP and HTTP-based applications that spreads requests across multiple servers. It is written in C and has a reputation for being fast and efficient (in terms of processor and memory usage).

How do I setup a floating IP?

Configuring the floating IP

To enable the floating IP, you need to add it as an alias to the NIC with your static IP. Start by checking which of your servers the floating IP is attached to. You will see the floating IP as an additional IP address under your Networks tab at the UpCloud control panel.

How do I create a floating IP address?

Creating a Floating IP Address Pool

1. Select Configure > Networking > Floating IP Pools. ...
2. Select the network you want to associate with a floating IP pool. ...
3. Click the add icon (+) to create a floating IP pool.
4. Add a Name and Description in the Floating IP Pools tab.

What is difference between elastic IP and public IP?

It is assigned to your AWS account. when an instance is terminated the public IP attached to it gets released and further when you relaunch the same instance new IP address is assigned. Elastic IP do not change and they remain same even if you terminate the instance and later again restart the same instance.