Configure Redis Servers

Oro architecture requires a least two instances of Redis server. The first instance will be used as fast persistent storage for sessions and the second one as LRU Cache storage.

Ubuntu Xenial or later

Install redis-server via apt

sudo apt install redis-server

Configure Second Instance as LRU Memory Cache

Create folders for the redis-cache server

sudo mkdir -p /var/lib/redis-cache /var/log/redis-cache /var/run/redis-cache
sudo chown redis:redis /var/lib/redis-cache /var/log/redis-cache /var/run/redis-cache

Create tmpfiles config

echo "d /run/redis-cache 2775 redis redis -" | sudo tee /usr/lib/tmpfiles.d/redis-cache-server.conf

Copy original configs for the second server

sudo cp -rp /etc/redis /etc/redis-cache

Replace all content in /etc/redis-cache/redis.conf with:

daemonize yes
pidfile /var/run/redis-cache/redis-server.pid
port 6380
tcp-backlog 511
bind 127.0.0.1
timeout 0
tcp-keepalive 0
loglevel notice
logfile /var/log/redis-cache/redis-server.log
databases 16
maxmemory 256mb
maxmemory-policy allkeys-lru
stop-writes-on-bgsave-error no
rdbcompression yes
rdbchecksum yes
dbfilename dump.rdb
dir /var/lib/redis-cache
slave-serve-stale-data yes
slave-read-only yes
repl-diskless-sync no
repl-diskless-sync-delay 5
repl-disable-tcp-nodelay no
slave-priority 100
appendonly no
appendfilename "appendonly.aof"
appendfsync everysec
no-appendfsync-on-rewrite no
auto-aof-rewrite-percentage 100
auto-aof-rewrite-min-size 64mb
aof-load-truncated yes
lua-time-limit 5000
slowlog-log-slower-than 10000
slowlog-max-len 128
latency-monitor-threshold 0
notify-keyspace-events ""
hash-max-ziplist-entries 512
hash-max-ziplist-value 64
list-max-ziplist-entries 512
list-max-ziplist-value 64
set-max-intset-entries 512
zset-max-ziplist-entries 128
zset-max-ziplist-value 64
hll-sparse-max-bytes 3000
activerehashing yes
client-output-buffer-limit normal 0 0 0
client-output-buffer-limit slave 256mb 64mb 60
client-output-buffer-limit pubsub 32mb 8mb 60
hz 10
aof-rewrite-incremental-fsync yes

Create systemd unit /lib/systemd/system/redis-cache-server.service for redis-cache with the following contents:

[Unit]
Description=Redis-Cache
After=network.target

[Service]
Type=forking
ExecStart=/usr/bin/redis-server /etc/redis-cache/redis.conf
PIDFile=/var/run/redis-cache/redis-server.pid
TimeoutStopSec=0
Restart=always
User=redis
Group=redis

ExecStartPre=-/bin/run-parts --verbose /etc/redis-cache/redis-server.pre-up.d
ExecStartPost=-/bin/run-parts --verbose /etc/redis-cache/redis-server.post-up.d
ExecStop=-/bin/run-parts --verbose /etc/redis-cache/redis-server.pre-down.d
ExecStop=/bin/kill -s TERM $MAINPID
ExecStopPost=-/bin/run-parts --verbose /etc/redis-cache/redis-server.post-down.d

PrivateTmp=yes
PrivateDevices=yes
ProtectHome=yes
ReadOnlyDirectories=/
ReadWriteDirectories=-/var/lib/redis-cache
ReadWriteDirectories=-/var/log/redis-cache
ReadWriteDirectories=-/var/run/redis-cache
CapabilityBoundingSet=~CAP_SYS_PTRACE

ProtectSystem=true
ReadWriteDirectories=-/etc/redis-cache

[Install]
WantedBy=multi-user.target
Alias=redis-cache.service

Enable and start systemd unit

systemctl enable redis-cache-server.service
systemctl start redis-cache

Verify the status of the new service

systemctl status redis-cache

See Configure Application to Use Redis for details on how to configure the application to use Redis.