Install redis on CentOS 7

1. Install Redis

# see How to Install Redis Server on CentOS 7 - http://linoxide.com/storage/install-redis-server-centos-7/

# --- Compiling ---
$ yum install gcc make tcl
$ REDIS_VER=3.2.3
$ wget http://download.redis.io/releases/redis-$REDIS_VER.tar.gz
$ tar xzvf redis-$REDIS_VER.tar.gz
$ cd redis-$REDIS_VER
$ make
$ make test
$ make install

// --- Installing ---
$ cd src
$ mkdir /etc/redis
$ mkdir -p /var/lib/redis/6379

2. System Configuration

# Set the vm.overcommit_memory to 1, which means always, this will avoid data to be truncated
$ sudo nano /etc/sysctl.conf
  vm.overcommit_memory=1
$ sysctl vm.overcommit_memory=1

# Change the maximum of backlog connections some value higher than the value on tcp-backlog option of redis.conf, which defaults to 511
$ sysctl -w net.core.somaxconn=512

# Disable transparent huge pages support, that is known to cause latency and memory access issues with Redis.
$ echo never > /sys/kernel/mm/transparent_hugepage/enabled

$ sysctl -w fs.file-max=100000

3. Configure Redis

# Copy sample redis.conf to /etc/redis/6379.conf.
$ cp redis.conf /etc/redis/6379.conf


# Set daemonize to no, systemd need it to be in foreground, otherwise Redis will suddenly die.
daemonize no

4. Security

See: http://linoxide.com/storage/install-redis-server-centos-7/

5. Starting at boot

# Copy sample init_script to /etc/init.d, note also the number of the port on the script name
$ cp utils/redis_init_script /etc/init.d/redis_6379

# edit new file /etc/systemd/system/redis_6379.service with the following content
[Unit]
Description=Redis on port 6379

[Service]
Type=forking
ExecStart=/etc/init.d/redis_6379 start
ExecStop=/etc/init.d/redis_6379 stop

[Install]
WantedBy=multi-user.target

$ systemctl enable redis_6379.service

6. Service commands

$ chkconfig --add redis
$ chkconfig --level 345 redis on
$ service redis start/stop/restart