How to check if redis master is OK?

Posted by e-satis on Server Fault See other posts from Server Fault or by e-satis
Published on 2012-10-03T21:34:36Z Indexed on 2012/10/03 21:41 UTC
Read the original article Hit count: 249

Filed under:

redis

|

availability

On the documentation, they advice the monitor command. But it has a 50% performance penalty for the whole system, and how should I do that ? Whatching the ouput using SSH until I don't see anything ?

Let's say I have 3 servers: 1 with a redis master, 1 with a redis slave, and one with my website querying the redis master.

How can I, from my website server, make cleany the decision to fallback to the slave by sending the SLAVEOF NO ONE command ?

My first step would be to put some kind of timeout check with a simple ping, just to be sure the server is online. But for redis specifically, I have no clue.

© Server Fault or respective owner

Related posts about redis

Trouble using Upstart to launch Redis as redis user

as seen on Super User - Search for 'Super User'
I'm trying to launch redis-server as a user (called redis) via Upstart. My /etc/init/redis-server.conf looks like this: description "redis server" start on runlevel [23] stop on shutdown exec sudo -u redis /usr/local/bin/redis-server /var/lib/redis/redis.conf Looks good, right? I start redis-server… >>> More
Booting the server redis no errors

as seen on Server Fault - Search for 'Server Fault'
The redis but usually begins with the following errors: tyler @ tyler-vortex: ~ / pens $. / src / redis-server [3690] Dec 01 10:56:05 # Warning: the specified config file, using the default config. In order to Specify a config file use 'redis-server / path / to / redis.conf' [3690] Dec 01 10:56:05… >>> More
Redis 2.0.3 would not let go of deleted appendonly.aof file after BGREWRITEAOF

as seen on Server Fault - Search for 'Server Fault'
Ubuntu 10.04.2, Redis 2.0.3 (more details at the end of the question). My AOF file for Redis is getting too large, to the point where it soon would threaten to take whole free disk space on my small-HDD VPS box: $ df -h Filesystem Size Used Avail Use% Mounted on /dev/xvda … >>> More
Troubles installing/starting Redis via Resque

as seen on Server Fault - Search for 'Server Fault'
Trying to complete instructions for Resque/Redis installation here: https://github.com/defunkt/resque/blob/master/README.markdown Am stuck at where I'm trying to start up Redis via Resque at the following command: Craig:/usr/local/src/resque$ rake redis:start (in /usr/local/src/resque) Detach… >>> More
Resque Runtime Error at /workers: wrong number of arguments for 'exists' command

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm having a runtime errror when i'm looking at the "workers" tab on resque-web (localhost). Everything else works. Edit: when this error occurs, i also have some (3 or 4) unknown workers 'not working'. I think they are responsible for the error but i don't understand how they got here Can you help… >>> More

Related posts about availability

AlwaysOn Architecture Guide: Building a High Availability and Disaster Recovery Solution by Using AlwaysOn Availability Groups

as seen on SQL Server Central - Search for 'SQL Server Central'
SQL Server 2012 AlwaysOn Availability Groups provides a unified high availability and disaster recovery (HADR) solution that improves upon legacy functionality previously found across disparate features. Prior to SQL Server 2012, several customers used database mirroring to provide local high availability… >>> More
High Availability - "Keeping Active"

as seen on Oracle Technology Network - Search for 'Oracle Technology Network'
Use Oracle Active Data Guard to set up a physical standby database for reporting and recovery. >>> More
Stratus: Where High-Availability Leads to Profitability

as seen on Internet.com - Search for 'Internet.com'
Server Snapshot: Stratus' fault-tolerant servers are designed to fill a clearly defined niche. Its positioning as the "availability company" has set it apart from the OEM Rat Pack and resulted in steady growth. >>> More
Stratus: Where High-Availability Leads to Profitability

as seen on Internet.com - Search for 'Internet.com'
Server Snapshot: Stratus' fault-tolerant servers are designed to fill a clearly defined niche. Its positioning as the "availability company" has set it apart from the OEM Rat Pack and resulted in steady growth. >>> More
Availability Best Practices on Oracle VM Server for SPARC

as seen on Oracle Blogs - Search for 'Oracle Blogs'
This is the first of a series of blog posts on configuring Oracle VM Server for SPARC (also called Logical Domains) for availability. This series will show how to how to plan for availability, improve serviceability, avoid single points of failure, and provide resiliency against hardware and software… >>> More