Redis#

I suggest moving the Redis database save files outside of the root partition. In this example we will use /redis as the database destination.

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.

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 and move existing content. Make sure to create a new partition first

    systemctl stop redis.service
mkdir /redis

# Mount the new partition here.

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

  3. edit the configuration file like this

    /etc/redis/redis.conf#
     1bind 127.0.0.1
 2protected-mode yes
 3port 0
 4tcp-backlog 511
 5unixsocket /var/run/redis/redis-server.sock
 6unixsocketperm 770
 7timeout 0
 8tcp-keepalive 300
 9daemonize yes
10supervised no
11pidfile /var/run/redis/redis-server.pid
12loglevel verbose
13logfile /var/log/redis/redis-server.log
14databases 32
15always-show-logo no
16save 900 1000
17save 300 10000
18save 60 10000000
19stop-writes-on-bgsave-error yes
20rdbcompression yes
21rdbchecksum yes
22dbfilename dump.rdb
23dir /redis
24replica-serve-stale-data yes
25replica-read-only yes
26repl-diskless-sync no
27repl-diskless-sync-delay 5
28repl-disable-tcp-nodelay no
29replica-priority 100
30lazyfree-lazy-eviction no
31lazyfree-lazy-expire no
32lazyfree-lazy-server-del no
33replica-lazy-flush no
34appendonly no
35appendfilename "appendonly.aof"
36appendfsync everysec
37no-appendfsync-on-rewrite no
38auto-aof-rewrite-percentage 100
39auto-aof-rewrite-min-size 64mb
40aof-load-truncated yes
41aof-use-rdb-preamble yes
42lua-time-limit 5000
43slowlog-log-slower-than 10000
44slowlog-max-len 128
45latency-monitor-threshold 0
46notify-keyspace-events ""
47hash-max-ziplist-entries 512
48hash-max-ziplist-value 64
49list-max-ziplist-size -2
50list-compress-depth 0
51set-max-intset-entries 512
52zset-max-ziplist-entries 128
53zset-max-ziplist-value 64
54hll-sparse-max-bytes 3000
55stream-node-max-bytes 4096
56stream-node-max-entries 100
57activerehashing no
58client-output-buffer-limit normal 0 0 0
59client-output-buffer-limit replica 256mb 64mb 60
60client-output-buffer-limit pubsub 32mb 8mb 60
61hz 10
62dynamic-hz yes
63aof-rewrite-incremental-fsync yes
64rdb-save-incremental-fsync yes

  4. edit the service unit file

    systemctl edit redis.service

    Add this content

    [Service]
ReadWritePaths=-/redis

  5. 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