Redis

To use Redis with the presented configuration, client programs need to access Redis’s socket at /var/run/redis/redis-server.sock. You need to add the running client users to the redis group. As an alternative you can also use socat to create a copy of the socket with the appropriate permissions.

Important

In this example we will use /redis as the database destination to avoid filling up the root partition.

See also

• amazon ec2 - Redis reports read-only filesystem, but it isn’t - Server Fault 1

1. install the dependencies

   apt-get update
   apt-get install redis-server rsync
   

2. create the new redis directory

   systemctl stop redis.service
   mkdir /redis
   

3. mount the partition in /redis

4. move the existing content

   rsync --avAX /var/lib/redis/dump.rdb /redis
   

5. edit the configuration file like this

   /etc/redis/redis.conf

   bind 127.0.0.1
   protected-mode yes
   port 0
   tcp-backlog 511
   unixsocket /var/run/redis/redis-server.sock
   unixsocketperm 770
   timeout 0
   tcp-keepalive 300
   daemonize yes
   supervised no
   pidfile /var/run/redis/redis-server.pid
   loglevel verbose
   logfile /var/log/redis/redis-server.log
   databases 32
   always-show-logo no
   save 900 1000
   save 300 10000
   save 60 10000000
   stop-writes-on-bgsave-error yes
   rdbcompression yes
   rdbchecksum yes
   dbfilename dump.rdb
   dir /redis
   replica-serve-stale-data yes
   replica-read-only yes
   repl-diskless-sync no
   repl-diskless-sync-delay 5
   repl-disable-tcp-nodelay no
   replica-priority 100
   lazyfree-lazy-eviction no
   lazyfree-lazy-expire no
   lazyfree-lazy-server-del no
   replica-lazy-flush no
   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
   aof-use-rdb-preamble 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-size -2
   list-compress-depth 0
   set-max-intset-entries 512
   zset-max-ziplist-entries 128
   zset-max-ziplist-value 64
   hll-sparse-max-bytes 3000
   stream-node-max-bytes 4096
   stream-node-max-entries 100
   activerehashing no
   client-output-buffer-limit normal 0 0 0
   client-output-buffer-limit replica 256mb 64mb 60
   client-output-buffer-limit pubsub 32mb 8mb 60
   hz 10
   dynamic-hz yes
   aof-rewrite-incremental-fsync yes
   rdb-save-incremental-fsync yes
   

6. edit the service unit file

   systemctl edit redis.service
   

   Add this content

   [Service]
   ReadWritePaths=-/redis
   

7. restart the service

   systemctl restart redis.service
   

Footnotes

1

https://serverfault.com/questions/942328/redis-reports-read-only-filesystem-but-it-isnt CC BY-SA 4.0, Copyright (c) 2018 serverfault.com contributors