windows wsl docker redis主从同步错误处理

目录

• 问题
  • overcommit_memory is set to 0
    • 1. 添加.wslconfig文件
    • 2. 重启wsl
  • Failed trying to load the MASTER synchronization DB from disk: No such file or directory
• 样例
  • master
  • slaver
• 参考

问题

在master中存入数据后，并没有同步到slave中

overcommit_memory is set to 0

WARNING overcommit_memory is set to 0! Background save may fail under low memory condition. To fix this issue add 'vm.overcommit_memory = 1' to /etc/sysctl.conf and then reboot or run the command 'sysctl vm.overcommit_memory=1' for this to take effect.

1. 添加.wslconfig文件

在 C:\Users<username> 创建.wslconfig 文件，文件内容如下

[wsl2]
kernelCommandLine = "sysctl.vm.overcommit_memory=1"

2. 重启wsl

wsl --shutdown

然后重启docker

Failed trying to load the MASTER synchronization DB from disk: No such file or directory

1:S 11 Jul 2022 16:00:44.569 # Failed trying to load the MASTER synchronization DB from disk: No such file or directory
1:S 11 Jul 2022 16:00:44.570 * Reconnecting to MASTER 172.25.0.101:6379 after failure
1:S 11 Jul 2022 16:00:44.570 * MASTER <-> REPLICA sync started
1:S 11 Jul 2022 16:00:44.570 * Non blocking connect for SYNC fired the event.
1:S 11 Jul 2022 16:00:44.571 * Master replied to PING, replication can continue...
1:S 11 Jul 2022 16:00:44.571 * Partial resynchronization not possible (no cached master)

redis官方配置redis.conf
其中有这么一段

# -----------------------------------------------------------------------------
#
# Replica can load the RDB it reads from the replication link directly from the
# socket, or store the RDB to a file and read that file after it was completely
# received from the master.
#
# In many cases the disk is slower than the network, and storing and loading
# the RDB file may increase replication time (and even increase the master's
# Copy on Write memory and replica buffers).
# However, parsing the RDB file directly from the socket may mean that we have
# to flush the contents of the current database before the full rdb was
# received. For this reason we have the following options:
#
# "disabled"    - Don't use diskless load (store the rdb file to the disk first)
# "on-empty-db" - Use diskless load only when it is completely safe.
# "swapdb"      - Keep current db contents in RAM while parsing the data directly
#                 from the socket. Replicas in this mode can keep serving current
#                 data set while replication is in progress, except for cases where
#                 they can't recognize master as having a data set from same
#                 replication history.
#                 Note that this requires sufficient memory, if you don't have it,
#                 you risk an OOM kill.
repl-diskless-load disabled

我们将上面的属性设置为on-empty-db即可

样例

给出的样例仅仅用于windows wsl docker本地测试，不具有正式环境部署参考价值

master

port 6379
protected-mode no

repl-diskless-sync no
repl-disable-tcp-nodelay no

# 这里不开启的话，slave不一定能同步成功
repl-diskless-load on-empty-db

# 开启AOF
appendonly yes

# 每秒钟备份
appendfsync everysec

slaver

port 6379
protected-mode no

slaveof 172.25.0.101 6379
slave-read-only yes
slave-serve-stale-data yes

# 这里不开启的话，slave不一定能同步成功
repl-diskless-load on-empty-db

# 开启AOF
appendonly yes
# 每秒钟备份
appendfsync everysec

参考

https://www.361shipin.com/blog/1512884685401751552
https://www.phpnanshen.com/article/156.html
https://download.redis.io/redis-stable/redis.conf
https://github.com/redis/redis/issues/4102