Redis資料遷移同步工具（redis-shake）

吳碼發表於2020-05-26
Redis

前言

最近線上一臺自建redis服務的伺服器頻繁報警，記憶體使用率有點高，這是一臺配置比較簡陋（2C8G）的機子了，近期也打算準備拋棄它了。拋棄之前需對原先的資料進行遷移，全量資料，增量資料都需要考慮，確保資料不丟失，在網上查了下發現了阿里自研的RedisShake工具，據說很妙，那就先試試吧。

實戰

正式操作前先在測試環境實踐一把看看效果如何，先說明下環境
源庫：192.168.28.142
目標庫：192.168.147.128

步驟一：
使用wget命令下載至本地
wget https://github.com/alibaba/RedisShake/releases/download/release-v2.0.2-20200506/redis-shake-v2.0.2.tar.gz
步驟二：
解壓，進入相應目錄看看有哪些東東

[root@dev ~]# cd /opt/redis-shake/
[root@dev redis-shake]# ls
redis-shake-v2.0.2.tar.gz
[root@dev redis-shake]# tar -zxvf redis-shake-v2.0.2.tar.gz 
redis-shake-v2.0.2/
redis-shake-v2.0.2/redis-shake.darwin
redis-shake-v2.0.2/redis-shake.windows
redis-shake-v2.0.2/redis-shake.conf
redis-shake-v2.0.2/ChangeLog
redis-shake-v2.0.2/stop.sh
redis-shake-v2.0.2/start.sh
redis-shake-v2.0.2/hypervisor
redis-shake-v2.0.2/redis-shake.linux
[root@dev redis-shake]# ls
redis-shake-v2.0.2  redis-shake-v2.0.2.tar.gz
[root@dev redis-shake]# cd redis-shake-v2.0.2
[root@dev redis-shake-v2.0.2]# ls
ChangeLog  hypervisor  redis-shake.conf  redis-shake.darwin  redis-shake.linux  redis-shake.windows  start.sh  stop.sh

步驟三：
更改配置檔案redis-shake.conf
日誌輸出

# log file，日誌檔案，不配置將列印到stdout (e.g. /var/log/redis-shake.log )
log.file =/opt/redis-shake/redis-shake.log

源端連線配置

# ip:port
# the source address can be the following:
#   1. single db address. for "standalone" type.
#   2. ${sentinel_master_name}:${master or slave}@sentinel single/cluster address, e.g., mymaster:master@127.0.0.1:26379;127.0.0.1:26380, or @127.0.0.1:26379;127.0.0.1:26380. for "sentinel" type.
#   3. cluster that has several db nodes split by semicolon(;). for "cluster" type. e.g., 10.1.1.1:20331;10.1.1.2:20441.
#   4. proxy address(used in "rump" mode only). for "proxy" type.
# 源redis地址。對於sentinel或者開源cluster模式，輸入格式為"master名字:拉取角色為master或者slave@sentinel的地址"，別的cluster
# 架構，比如codis, twemproxy, aliyun proxy等需要配置所有master或者slave的db地址。
source.address = 192.168.28.142:6379
# password of db/proxy. even if type is sentinel.
source.password_raw = xxxxxxx

目標端設定

# ip:port
# the target address can be the following:
#   1. single db address. for "standalone" type.
#   2. ${sentinel_master_name}:${master or slave}@sentinel single/cluster address, e.g., mymaster:master@127.0.0.1:26379;127.0.0.1:26380, or @127.0.0.1:26379;127.0.0.1:26380. for "sentinel" type.
#   3. cluster that has several db nodes split by semicolon(;). for "cluster" type.
#   4. proxy address. for "proxy" type.
target.address = 192.168.147.128:6379
# password of db/proxy. even if type is sentinel.
target.password_raw = xxxxxx
# auth type, don't modify it
target.auth_type = auth
# all the data will be written into this db. < 0 means disable.
target.db = -1

步驟四
./start.sh redis-shake.conf sync
檢視日誌檔案

2020/05/15 09:00:29 [INFO] DbSyncer[0] starts syncing data from 192.168.28.142:6379 to [192.168.147.128:6379] with http[9321], enableResumeFromBreakPoint[false], slot boundary[-1, -1]
2020/05/15 09:00:29 [INFO] DbSyncer[0] psync connect '192.168.28.142:6379' with auth type[auth] OK!
2020/05/15 09:00:29 [INFO] DbSyncer[0] psync send listening port[9320] OK!
2020/05/15 09:00:29 [INFO] DbSyncer[0] try to send 'psync' command: run-id[?], offset[-1]
2020/05/15 09:00:29 [INFO] Event:FullSyncStart Id:redis-shake 
2020/05/15 09:00:29 [INFO] DbSyncer[0] psync runid = 0a08aa75b91f8724014e056cd2c3068eebf81ec4, offset = 126, fullsync
2020/05/15 09:00:30 [INFO] DbSyncer[0] +
2020/05/15 09:00:30 [INFO] DbSyncer[0] rdb file size = 45173748
2020/05/15 09:00:30 [INFO] Aux information key:redis-ver value:4.0.10
2020/05/15 09:00:30 [INFO] Aux information key:redis-bits value:64
2020/05/15 09:00:30 [INFO] Aux information key:ctime value:1589521609
2020/05/15 09:00:30 [INFO] Aux information key:used-mem value:66304824
2020/05/15 09:00:30 [INFO] Aux information key:repl-stream-db value:0
2020/05/15 09:00:30 [INFO] Aux information key:repl-id value:0a08aa75b91f8724014e056cd2c3068eebf81ec4
2020/05/15 09:00:30 [INFO] Aux information key:repl-offset value:126
2020/05/15 09:00:30 [INFO] Aux information key:aof-preamble value:0
2020/05/15 09:00:30 [INFO] db_size:8 expire_size:0
2020/05/15 09:00:31 [INFO] DbSyncer[0] total = 43.08MB -      10.87MB [ 25%]  entry=0             filter=4           
2020/05/15 09:00:32 [INFO] DbSyncer[0] total = 43.08MB -      21.78MB [ 50%]  entry=0             filter=5           
2020/05/15 09:00:33 [INFO] DbSyncer[0] total = 43.08MB -      32.64MB [ 75%]  entry=0             filter=5           
2020/05/15 09:00:34 [INFO] DbSyncer[0] total = 43.08MB -      42.92MB [ 99%]  entry=0             filter=6           
2020/05/15 09:00:34 [INFO] db_size:1 expire_size:0
2020/05/15 09:00:34 [INFO] db_size:48 expire_size:12
2020/05/15 09:00:34 [INFO] db_size:533 expire_size:468
2020/05/15 09:00:34 [INFO] DbSyncer[0] total

檢視下資料同步情況，如下圖，發現所有的庫都同步過來了，非常nice。

但如果只想同步某個庫又該怎麼操作呢？
馬上查閱了配置檔案及官方文件，稍作調整就可以，具體如下

配置項 說明
target.db 設定待遷移的資料在目的Redis中的邏輯資料庫名。例如，要將所有資料遷移到目的Redis中的DB10，則需將此引數的值設定為10。當該值設定為-1時，邏輯資料庫名在源Redis和目的Redis中的名稱相同，即源Redis中的DB0將被遷移至目的Redis中的DB0，DB1將被遷移至DB1，以此類推。
filter.db.whitelist 指定的db被通過，比如0;5;10將會使db0, db5, db10通過, 其他的被過濾

那比如我這邊只想把源端的10庫同步至目標端的10庫只需對配置檔案進行如下改動

target.db = 10
filter.db.whitelist =10

重新執行步驟四命令，執行後效果如下，大功告成。

另外還有一個配置項特意說明下

配置項 說明
key_exists 當源目的有重複key，是否進行覆寫。rewrite表示源端覆蓋目的端。none表示一旦發生程式直接退出。ignore表示保留目的端key，忽略源端的同步key。該值在rump模式下沒有用。

當前僅僅是單個節點到單個節點的同步，如涉及到叢集等其他一些場景下，請參考官方文件說明，自行測試。

參考文件

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