What is Keepalived service?

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.

What is Keepalived used for?

Keepalived uses the IP Virtual Server (IPVS) kernel module to provide transport layer (Layer 4) load balancing, redirecting requests for network-based services to individual members of a server cluster.

How do I set up 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.

How does VRRP protocol work?

VRRP enables hosts on a LAN to make use of redundant routing platforms on that LAN without requiring more than the static configuration of a single default route on the hosts. The VRRP routing platforms share the IP address corresponding to the default route configured on the hosts.

What is Virtual_router_id?

virtual_router_id is a numerical identifier for the Virtual Router instance. It must be the same on all LVS Router systems participating in this Virtual Router. It is used to differentiate multiple instances of keepalived running on the same network interface.

What are the configuration keywords for keepalived?

The Keepalived configuration file uses the following synopsis (configuration keywords are Bold/Italic): Email type: Is a string using charset as specified into the SMTP RFC eg: “ user @ domain. com ”

Which is the fastest way to install keepalived?

Although installing from the repositories is generally the fastest way to get keepalived running on a system, the version of keepalived available in the repositories are typically a few releases behind the latest available stable version. As of Red Hat 6.4, Red Hat and the clones have included the keepalived package in the base repository.

What do I need to make keepalived compile?

Compiling keepalived requires a compiler, OpenSSL and the Netlink Library. You may optionally install Net-SNMP, which is required for SNMP support. On RHEL, install the following prerequisites: On Debian, install the following prerequisites: Use curl or any other transfer tool such as wget to download keepalived.

How to install keepalived from source in Debian?

Run the following to install the keepalived package and all the required dependencies using Debian’s APT package handling utility: In order to run the latest stable version, compile keepalived from source. Compiling keepalived requires a compiler, OpenSSL and the Netlink Library.