Microsoft Store上 看到最新的`Ubuntu 20.04 LTS` 已經適配到`WSL`上了, 於是解除安裝了老版本 `18.04 LTS`，安裝上了最新版本的。 第一次啟動會比較慢，需耐心等待，接著是建立使用者帳戶和密碼([Ref-1](https://docs.microsoft.com/zh-cn/windows/wsl/user-support)) ```bash Installing, this may take a few minutes... ``` 看了下`WSL`的官方文件，發現`WSL`對各種資料庫的支援([Ref-2](https://docs.microsoft.com/zh-cn/windows/wsl/tutorials/wsl-database))還真是蠻全的。 更讓我驚喜的是WSL和Window其實可以互操作([Ref-3](https://docs.microsoft.com/zh-cn/windows/wsl/interop)): 既可以從 Windows 命令列執行 Linux 工具，也可以從 Linux 命令列執行 Windows 工具。以前一直以為`WSL`只是提供了 Linux 模擬環境，可以讓使用 Windows 的開發人員敲敲 Linux 命令，哈哈，認識真的太淺薄了。這對於Redis尤其有用，再也不用安裝萬年不變的**3.2.100**([Ref-4](https://www.redis.com.cn/redis-installation))了(當然，你也可以在Docker中使用Redis)。 #### 啟動執行Redis，解決啟動問題 安裝好`Redis`以後，在`WSL`中執行Redis ```bash root@WSL:~# redis-server --version Redis server v=5.0.7 sha=00000000:0 malloc=jemalloc-5.2.1 bits=64 build=636cde3b5c7a3923 root@WSL:~# sudo service redis-server start Starting redis-server: redis-server. root@WSL:~# redis-cli 127.0.0.1:6379> set Redis "Hello Redis!" OK 127.0.0.1:6379> get Redis "Hello Redis!" ``` 設定Redis在後臺執行，並檢視當前程序(有兩個Redis例項在執行，注意**後臺例項的啟動PID是1738，執行子PID是1739**) ```bash root@WSL:~# redis-server --daemonize yes 1738:C 16 Aug 2020 18:03:11.055 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo 1738:C 16 Aug 2020 18:03:11.055 # Redis version=5.0.7, bits=64, commit=00000000, modified=0, pid=1738, just started 1738:C 16 Aug 2020 18:03:11.056 # Configuration loaded root@WSL:~# ps -aux --sort=tty,command USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND root 1 0.0 0.0 8892 284 ? Ssl 17:34 0:00 /init redis 1602 0.0 0.0 61300 3836 ? Ssl 17:44 0:00 /usr/bin/redis-server 127.0.0.1:6379 root 1739 0.0 0.0 55668 2828 ? Ssl 18:03 0:00 redis-server *:6379 kevin 1643 0.0 0.0 18076 3528 tty1 S 17:46 0:00 -bash root 1721 0.0 0.0 18080 3516 tty1 S 17:59 0:00 -bash root 1642 0.0 0.0 8900 204 tty1 Ss 17:46 0:00 /init root 1743 0.0 0.0 18880 1996 tty1 R 18:06 0:00 ps -aux --sort=tty,command root 1720 0.0 0.0 18908 2680 tty1 S 17:59 0:00 sudo -i ``` 把玩了一番，發現Redis無法啟動，搜了以下，通過刪除`/var/run/redis/redis-server.pid` 解決了問題。 ```bash root@WSL:~# sudo service redis-server start Starting redis-server: start-stop-daemon: matching on world-writable pidfile /var/run/redis/redis-server.pid is insecurefailed root@WSL:~# rm -f /var/run/redis/redis-server.pid root@WSL:~# sudo service redis-server start Starting redis-server: redis-server. root@WSL:~# sudo service redis-server status * redis-server is running ``` #### 通過`CMD`或`PowerShell`執行 Redis CMD/PowerShell 通過`wsl`命令進入WSL環境, 這時 WSL 會**自動掛載當前目錄**，也可以直接`wsl redis-server`([Ref-5](https://docs.microsoft.com/zh-cn/windows/wsl/reference#wslexe))啟動 Redis。Redis在standalone模式下，控制檯無法進行互動。 ```cmd C:\>wsl kevin@WSL:/mnt/c# redis-server 2093:C 16 Aug 2020 18:44:15.097 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo 2093:C 16 Aug 2020 18:44:15.097 # Redis version=5.0.7, bits=64, commit=00000000, modified=0, pid=2093, just started 2093:C 16 Aug 2020 18:44:15.097 # Warning: no config file specified, using the default config. In order to specify a config file use redis-server /path/to/redis.conf 2093:M 16 Aug 2020 18:44:15.098 * Increased maximum number of open files to 10032 (it was originally set to 1024). _._ _.-``__ ''-._ _.-`` `. `_. ''-._ Redis 5.0.7 (00000000/0) 64 bit .-`` .-```. ```\/ _.,_ ''-._ ( ' , .-` | `, ) Running in standalone mode |`-._`-...-` __...-.``-._|'` _.-'| Port: 6379 | `-._ `._ / _.-' | PID: 2093 `-._ `-._ `-./ _.-' _.-' |`-._`-._ `-.__.-' _.-'_.-'| | `-._`-._ _.-'_.-' | http://redis.io `-._ `-._`-.__.-'_.-' _.-' |`-._`-._ `-.__.-' _.-'_.-'| | `-._`-._ _.-'_.-' | `-._ `-._`-.__.-'_.-' _.-' `-._ `-.__.-' _.-' `-._ _.-' `-.__.-' 2093:M 16 Aug 2020 18:44:15.109 # WARNING: The TCP backlog setting of 511 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 128. 2093:M 16 Aug 2020 18:44:15.110 # Server initialized 2093:M 16 Aug 2020 18:44:15.111 # 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. 2093:M 16 Aug 2020 18:44:15.113 * Ready to accept connections ``` 直接掛載C盤根目錄可能導致`CTRL`+`C`無法退出, 在其他控制檯，通過`kill -9 PID`可終止該Redis例項(2093)的執行。 ```cmd 2093:signal-handler (1597575573) Received SIGINT scheduling shutdown... 2093:M 16 Aug 2020 18:59:33.301 # User requested shutdown... 2093:M 16 Aug 2020 18:59:33.302 * Saving the final RDB snapshot before exiting. 2093:M 16 Aug 2020 18:59:33.303 # Failed opening the RDB file dump.rdb (in server root dir /mnt/c) for saving: Permission denied 2093:M 16 Aug 2020 18:59:33.304 # Error trying to save the DB, can't exit. 2093:M 16 Aug 2020 18:59:33.305 # SIGTERM received but errors trying to shut down the server, check the logs for more information ``` 還可以通過`redis-server &`使Redis在後臺執行, 和直接`redis-server`執行不同，`CTRL`+`C`關閉以後，通過`ps`命令檢視，發現PID(2329)仍在執行, 但是這種後臺模式和守護模式(daemonize yes)的STAT([Ref-6](https://askubuntu.com/questions/360252/what-do-the-stat-column-values-in-ps-mean)) 是不同的。 ```powershell kevin@WSL:/$ redis-server & [1] 2329 kevin@WSL:/$ 2329:C 16 Aug 2020 19:36:10.196 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo 2329:C 16 Aug 2020 19:36:10.196 # Redis version=5.0.7, bits=64, commit=00000000, modified=0, pid=2329, just started 2329:C 16 Aug 2020 19:36:10.196 # Warning: no config file specified, using the default config. In order to specify a config file use redis-server /path/to/redis.conf 2329:M 16 Aug 2020 19:36:10.197 * Increased maximum number of open files to 10032 (it was originally set to 1024). _._ _.-``__ ''-._ _.-`` `. `_. ''-._ Redis 5.0.7 (00000000/0) 64 bit .-`` .-```. ```\/ _.,_ ''-._ ( ' , .-` | `, ) Running in standalone mode |`-._`-...-` __...-.``-._|'` _.-'| Port: 6379 | `-._ `._ / _.-' | PID: 2329 `-._ `-._ `-./ _.-' _.-' |`-._`-._ `-.__.-' _.-'_.-'| | `-._`-._ _.-'_.-' | http://redis.io `-._ `-._`-.__.-'_.-' _.-' |`-._`-._ `-.__.-' _.-'_.-'| | `-._`-._ _.-'_.-' | `-._ `-._`-.__.-'_.-' _.-' `-._ `-.__.-' _.-' `-._ _.-' `-.__.-' 2329:M 16 Aug 2020 19:36:10.202 # WARNING: The TCP backlog setting of 511 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 128. 2329:M 16 Aug 2020 19:36:10.202 # Server initialized 2329:M 16 Aug 2020 19:36:10.202 # 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. 2329:M 16 Aug 2020 19:36:10.202 * Ready to accept connections ^C kevin@WSL:/$ ps -aux --sort=tty,command USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND root 1 0.0 0.0 8892 264 ? Ssl 17:34 0:00 /init redis 1602 0.0 0.0 61300 3836 ? Ssl 17:44 0:00 /usr/bin/redis-server 127.0.0.1:6379 root 1739 0.0 0.0 55668 2828 ? Ssl 18:03 0:00 redis-server *:6379 kevin 1643 0.0 0.0 18076 3084 tty1 S 17:46 0:00 -bash root 1721 0.0 0.0 18212 3432 tty1 S 17:59 0:00 -bash root 1642 0.0 0.0 8900 176 tty1 Ss 17:46 0:00 /init root 1720 0.0 0.0 18908 2140 tty1 S 17:59 0:00 sudo -i kevin 2178 0.0 0.0 18208 3684 tty2 S 19:12 0:00 -bash root 2177 0.0 0.0 8900 200 tty2 Ss 19:12 0:00 /init kevin 2333 0.0 0.0 18880 2000 tty2 R 19:36 0:00 ps -aux --sort=tty,command kevin 2329 0.1 0.0 55668 4080 tty2 Sl 19:36 0:00 redis-se