This guide presents a simple of how to install Redis on Ubuntu 18.04 LTS. So what is Redis? Redis is a free and open-source in-memory database. It implements different key-value data structures some of them being sets, bitmaps, hashes, lists, strings, streams…Redis can function as a cache, database or message broker.<\/p>\n
To begin with, re-synchronize your system packages to the latest versions.<\/p>\n
apt update\r\napt upgrade<\/code><\/pre>\nAfter the package update and upgrade is done, proceed to install Redis on Ubuntu 18.04 LTS server.<\/p>\n
Install Redis on Ubuntu 18.04 LTS<\/h3>\n
Installation of Redis on Ubuntu 18.04 is pretty simple since the package is contained on default Ubuntu repositories. Hence, use the package manager to install it as shown below;<\/p>\n
apt install redis-server<\/code><\/pre>\nThis command installs Redis server and all the required dependencies on Ubuntu 18.04.<\/p>\n
Configuring Redis on Ubuntu 18.04<\/h4>\n
Redis is now installed on Ubuntu 18.04. Before we can Redis as a service, there are a few configuration adjustments that we are going to make in its main configuration file,
\/etc\/redis\/redis.conf<\/code>. The adjustment that we are going to make is to definesystemd<\/code> as the init system that will manage the Redis service. This can be achieved by changing the linesupervised no<\/code> tosupervised systemd<\/code>.<\/p>\nvim \/etc\/redis\/redis.conf<\/code><\/pre>\n...\r\n# If you run Redis from upstart or systemd, Redis can interact with your\r\n# supervision tree. Options:\r\n# supervised no - no supervision interaction\r\n# supervised upstart - signal upstart by putting Redis into SIGSTOP mode\r\n# supervised systemd - signal systemd by writing READY=1 to $NOTIFY_SOCKET\r\n# supervised auto - detect upstart or systemd method based on\r\n# UPSTART_JOB or NOTIFY_SOCKET environment variables\r\n# Note: these supervision methods only signal \"process is ready.\"\r\n# They do not enable continuous liveness pings back to your supervisor.\r\n#supervised no\r\nsupervised systemd\r\n...<\/strong><\/code><\/pre>\nRestart Redis Server<\/h3>\n
When installation completes, Redis server is set to start by default. To clear the doubt, execute the command below to check the Redis server service status.<\/p>\n
systemctl status redis-server<\/code><\/pre>\n\u25cf<\/span> redis-server.service - Advanced key-value store\r\n Loaded: loaded (\/lib\/systemd\/system\/redis-server.service; enabled; vendor preset: enabled)\r\n Active: active (running)<\/span> since Sun 2019-01-13 16:41:41 EAT; 2min 1s ago\r\n Docs: http:\/\/redis.io\/documentation,\r\n man:redis-server(1)\r\n Main PID: 22095 (redis-server)\r\n Tasks: 4 (limit: 1110)\r\n CGroup: \/system.slice\/redis-server.service\r\n \u2514\u250022095 \/usr\/bin\/redis-server 127.0.0.1:6379<\/code><\/pre>\nHowever, since we have made some configuration changes, be sure to restart it.<\/p>\n
systemctl restart redis-server<\/code><\/pre>\nRedis server is also set to run on system reboot. This can be verified by running the command below;<\/p>\n
systemctl list-unit-files --state=enabled | grep redis-server\r\nredis-server.service enabled<\/code><\/pre>\nTesting Redis Server on Ubuntu 18.04<\/h3>\n
So that we can be sure that we have installed Redis server on Ubuntu 18.04 and working fine, you can perform a few simple tests using Redis command line tool called
redis-cli<\/code>. Redis server by default listens on TCP port6379<\/code> and loopback address,127.0.0.1<\/code>. As a result,redis-cli<\/code> connect to Redis server via127.0.0.1:6378<\/code>.<\/p>\nTo test the connection, we are going to perform the simple ping pong test. See below.<\/p>\n
redis-cli \r\n127.0.0.1:6379> ping<\/strong>\r\nPONG < Response from server\r\n127.0.0.1:6379><\/code><\/pre>\nThis can also be done using a one line command;<\/p>\n
redis-cli -h 127.0.0.1 -p 6379 ping\r\nPONG<\/code><\/pre>\n