Questions tagged [redis]
Redis is an open source, highly-scalable key-value store, commonly referred to as a "NoSQL database."
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Redis (error) NOAUTH Authentication required
I get the error:
(error) NOAUTH Authentication required.
When in redis-cli and trying to display the KEYS *. I've only set a requirepass not an auth afaiac. I'm in the redis.conf but do not know ...
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votes
3
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SElinux: allow httpd to connect to a specific port
My system is running CentOS 6.4 with apache2.2.15. SElinux is enforcing and I'm trying to connect to a local instance of redis through my python/wsgi app. I get Error 13, Permission denied. I could ...
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Redis Cluster: (error) MOVED
I have a Redis cluster with the following nodes:
192.168.0.14:6379 master (slots from 0 to 16383)
192.168.0.15:6379 slave (slots from 0 to 16383)
192.168.0.16:6379 master (without slots)
...
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6
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Redis not starting with systemctl
I have installed redis on an ubuntu 16.04 machine and if I run /usr/local/bin/redis-server /etc/redis/cluster/7000/redis.conf it starts up and I can connect to it without issues.
However I want to ...
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votes
1
answer
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Scaling Logstash (with redis/elasticsearch)
Over a cluster of over 12 centos 5.8 servers, I deployed logstash using the native logstash shipper, which sends /var/log/*/*.log back to a central logstash server.
We tried using rsyslogd as the ...
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answers
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Tips for maximizing Nginx requests/sec?
I'm building an analytics package, and project requirements state that I need to support 1 billion hits per day. Yep, "billion". In other words, no less than 12,000 hits per second sustained, and ...
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4
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Redis cluster: 3 master nodes minimum?
I'm evaluating the cluster capabilities of Redis 3 (I'm using Redis 2 standalone at the moment), so I am reading the info at http://redis.io/topics/cluster-tutorial.
In this document I read a very ...
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2
answers
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Avoiding swap on ElastiCache Redis
We have been having ongoing trouble with our ElastiCache Redis instance swapping. Amazon seems to have some crude internal monitoring in place which notices swap usage spikes and simply restarts the ...
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3
answers
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Some Linux systems become very slow when Redis is loading a big dataset
I received a report from a Redis user, and I'm not sure what to reply as I'm not an expert in the area of Linux and its scheduler, however we (as the Redis project) need to figure this kind of issues ...
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2
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Why isn't systemctl starting redis-server on CentOS 7?
I've installed redis on a new CentOS 7 box but can't start it using systemctl.
It was installed like this:
rpm -i http://dl.fedoraproject.org/pub/epel/beta/7/x86_64/epel-release-7-0.2.noarch.rpm
yum ...
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13
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5
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Connect remotely to ElastiCache - Redis
We are using ElastiCache - Redis for our site, we need to flush the Redis cache and when I try to connect to my ElastiCache - Redis remotely by this command from any PC
redis-cli -h example-redis-1....
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votes
1
answer
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Is it safe to delete redis dump and temp files from /var/lib/redis/
I don't know anything about redis and right now i have to free disk space before it fills up.
I see some old redis files in /var/lib/redis/ and the file names are like
dump1252.rdb
dump1254.rdb
...
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votes
2
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How can I disable an Azure Redis Cache?
I have been experimenting with the Azure Redis Cache preview, and so far, so good. However, when I am not using it, I would like to disable it so that it is not consuming memory and not accessible.
...
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3
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node.js, mongodb, redis, on ubuntu performance degradation in production, RAM is free, CPU 100%
As the question title suggests, I'm having an hard time to figure out what can be improved on my application(or tuned in the os, ubuntu) to achieve an acceptable performance. But first I'll explain ...
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1
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How to turn off 'protected-mode' in Redis?
I'd like to disable protected-mode on my production Redis. Regarding to the following error I got from my other Redis-Sentinel instance I could disable it live by connecting to Redis from the master ...
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3
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Redis installation on centos 6.5
I am trying to install Redis on centos 6.5 (x64) with following line:
yum install redis
But I am getting following screen:
[root@NodeJs ~]# yum install redis
Loaded plugins: fastestmirror
Setting ...
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votes
2
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How to handle Redis raising memory fragmentation?
I have a Redis 3.0.5 instance that tend to show growing mem_fragmentation_ratio over time.
The application using that instance is constantly creating and deleting keys.
After one month, I end up ...
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How to troubleshoot redis high CPU usage? And how to limit Redis CPU usage?
We have inherited a system in which there is a central server for queuing operations. Redis is chosen as queuing agent.
Once in a while (like each 2-3 days) Redis service CPU usage goes even over 100%....
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4
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How to install and configure Redis server on Amazon Linux 2023 (AL2023)?
Amazon Linux 2023 is loosely based on Fedora 34, 35 and 36 as per aws:
https://docs.aws.amazon.com/linux/al2023/ug/relationship-to-fedora.html
However redis package is not available in AL2023, instead ...
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How can I block port 6379 for outside traffic on ubuntu?
I want to block access to port 6379 on my server, but I still want to connect to it internally. The redis-server application runs on that port and I want to connect to it only locally (127.0.0.1). ...
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3
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How do I load the dump.rdb file into redis?
I have a dump.rdb file, which is in the same directory as redis.config.
When I start my sever:
redis-server ./redis.config
It does not load the data in that 1 GB file.
How do I load that data?
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Redis reports read-only filesystem, but it isn't
I get this in my Redis logs:
1182:M 30 Nov 14:27:00.028 * 1 changes in 900 seconds. Saving...
1182:M 30 Nov 14:27:00.029 * Background saving started by pid 1920
1920:C 30 Nov 14:27:00.029 # Failed ...
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upgrading from Redis 2.8.19 to 3.0.1
I currently have installed Redis 2.8.19 but I'm looking to upgrade to the latest stable release 3.0.1. Originally I downloaded, uncompressed, and compiled 2.8.9. What is the recommended approach to ...
9
votes
4
answers
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Why does redis report limit of 1024 files even after update to limits.conf?
I see this error at the top of my redis.log file:
Current maximum open files is 1024. maxclients has been reduced to
4064 to compensate for low ulimit.
I have followed these steps to the letter (...
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votes
1
answer
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Redis Multi-Master Replication
Scenario: We have two datacentres which run concurrently (both serve traffic).
Each has it's own entire stack of infrastructure, so it can operate without the other being up.
That said, we would ...
user65539
8
votes
3
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How do I configure another instance of redis on ubuntu?
I basically want to have 2 instances of redis on Ubuntu. I looked at /etc/init.d/redis-server script and tried to create a new one (redis-server-dev) pointing to another config file (new port etc) ...
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Cannot connect to Redis installed on VirtualBox running Ubuntu from Windows 7
I've setup an Ubuntu image on VirtualBox on a Windows 7 host. On the Ubuntu guest I've installed Redis which runs on port 6379 (TCP) by default.
I've setup port forwarding using the VirtualBox GUI ...
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4
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Redis won't shutdown
Most of the time when I reboot my Ubunutu server, I get "Waiting for Redis to shutdown…" over and over and it never stops until I force reboot. What could cause this?
I have http://godrb.com/ ...
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How can I generate a command for start-stop-daemon that will kill the process if it doesn't term during a timeout period?
I need to run a start-stop-daemon for a redis instance and I want it to send a SIGTERM and if the redis instance doesn't quit i would like it to force a quit.
The start-stop-daemon configuration says ...
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votes
1
answer
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Redis appendonly.aof file size out of control
I host a Rails 5 website that uses Sidekiq to manage its background jobs. The problem I have is that regularly the appendonly.aof file grows to big that it fills that whole disk where it is saved.
...
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2
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Troubleshooting a Redis Stall
We have several redis instances running on a server. There are also multiple web tier servers connecting to those instance that experience a stall at the same time.
We had packet captures going at ...
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Redis high availability and load balancing
I'm using Redis for some time and now we want to move to a redundant cluster which would be fault tolerant, highly available and load balanced.
I principally use Redis for some PHP web application ...
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How do you get Redis connections working within an Amazon VPC private subnet?
I have an Amazon VPC setup with a private subnet containing 2 instances. One of them has redis running on it, the other instance I want to use to connect to the redis server. I have the redis instance ...
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2
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Redis vs Memcache
I'm a bit new to Memcache and Redis and I'm trying to understand the difference between the two and what each actually is.
As has been explained to me Memcache is a database caching solution. Data ...
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How to uninstall the redis installed from source in ubuntu 12.04?
I'd installed the redis-server on Ubuntu 12.04 from source.
But at somepoint it couldn't get installed fully, failed on last make install cmd.
Then I just installed via apt package.
Now I'm confused ...
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Setting up multiple redis masters
In recent study, I was led to the belief that it is not possible for redis to be setup with multiple masters with each master having 2 slaves.
https://github.com/uolter/redis_failover/issues/4#...
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How can you link nodes in a redis cluster via hostname instead of ip?
Redis cluster requires that all nodes can see each other to chatter; to accommodate some trivial situations (eg. docker with all nodes publicly exposed) some additional config options are available:
...
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Redis reload configuration changes without restarting service
When I change redis configuration via puppet, is there a better way to load the configuration other than restarting the redis service?
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How do I install the latest stable version of Redis?
I am new to redis. and I just followed cli to install redis sudo apt-get install redis.
but the install server version is 2.2.12 . If I want to update this version and I want to install redis 2.7 + ...
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Redis with custom data dir: systemd config file changed automatically?
I'm running Redis 4.0.9 on Ubuntu 18.04.1 LTS with a custom data dir for the RBD file.
To make this work, besides updating the dir in redis.conf to the new location, I also had to update /etc/systemd/...
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Redis 2.8.12 slave sync failing
I'm getting the following error when trying to sync from same version master in redis cloud:
# Server started, Redis version 2.8.12
* The server is now ready to accept connections on port 6379
* ...
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Installing additional LUA modules into Redis
I'm trying to get Redis to allow EVAL (http://redis.io/commands/EVAL) to make HTTP requests.
Two modules: LuaCURL and Luasocket give this ability. The Redis source code has a directory with ...
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1
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Redis connection issue
We are currently experiencing a lot of Redis errors with the message
Unable to connect: read error on connection, trying next server
We run Redis on FreeBSD using PHP Redis and we have a hard time ...
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3
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How to secure Redis cluster on AWS elasticache
I have been reading up on Redis with AWS Elasticache and am a little confused on security. So far, it seems the only security is to create a Redis Security Group that only allows access from either a ...
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2
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Is installing multiple redis instances on the server a good idea?
As title says. I'm considering creating a state service farm using redis, and I'd like to handle multiple "regions" - that way, if a service goes down only a single region should be affected. This may ...
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Redis doesn't start when run as service - can't chdir: permission denied
I have been running redis which I built from source for several months, but I switched to using a package manger for it today (running on Debian). It ran fine until I changed the working directory to /...
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How does one close all _existing_ TCP connections on some ports using IPTables?
Say I have a quick network partition test that I'd like to run, like disconnecting two halves of a ReDiS cluster from each other, and I want to use IPTables to temporarily disconnect one group of ...
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Starting Redis as a service on OS X with Homebrew
I installed Redis via brew install redis and attempted to add it as a service via:
ln -sfv /usr/local/opt/redis/*.plist ~/Library/LaunchAgents
launchctl load ~/Library/LaunchAgents/homebrew.mxcl....
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3
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AWS Redis Encryption in-transit + TLS EC2 Connection
I'm already using AWS Elasticache Redis but without "Encryption in-transit". I've created a new small/temp cluster with this Encryption Enabled but I can't connect to it -
redis-cli error: ...
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1
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Unable to start Redis under SELinux
I having a rather persistent issue with my Redis instance. While SELinux is in enforcing mode, Redis server is unable to start:
[root@server ~]# service redis start
Starting redis-server: ...
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