编译安装redis，systemtcl配置redis自启动，系统并发调优

1、编译安装redis

wget https://download.redis.io/releases/redis-7.4.2.tar.gz
tar -zxf redis-7.4.2.tar.gz
cd redis-7.4.2/
make
make install/usr/local/bin/redis-server -v

2、systemtcl配置redis自启动

[Unit]
Description=Redis In-Memory Data Store
After=network.target[Service]
User=redis
Group=redis
ExecStart=/usr/local/bin/redis-server /etc/redis/redis.conf
ExecStop=/usr/local/bin/redis-cli -a 1234qwer shutdown
Restart=always
Type=simple[Install]
WantedBy=multi-user.target

注意：

（1）如果在命令行里复制粘贴，可能会丢失前四个字母。

可通过systemd-analyze verify /etc/systemd/system/redis.service验证语法是否正确

[root@iZ8vb45ie77v5ybgcemxysZ ~]# systemctl enable redis
Failed to execute operation: Bad message
# 检验/etc/systemd/system/redis.service文件格式
[root@iZ8vb45ie77v5ybgcemxysZ ~]# systemd-analyze verify /etc/systemd/system/redis.service
[/etc/systemd/system/redis.service:1] Assignment outside of section. Ignoring.
[/etc/systemd/system/redis.service:2] Assignment outside of section. Ignoring.
[/etc/systemd/system/redis.service:3] Assignment outside of section. Ignoring.
[root@iZ8vb45ie77v5ybgcemxysZ ~]# systemd-analyze verify /etc/systemd/system/redis.service
[root@iZ8vb45ie77v5ybgcemxysZ ~]#

（2）如果redis配置了密码，停止命令要加上redis-cli -a <密码> [操作参数]

# 无密码关闭
ExecStop=/usr/local/bin/redis-cli shutdown
# 有密码关闭
ExecStop=/usr/local/bin/redis-cli -a 1234qwer shutdown

3、权限不足导致redis无法重启的问题

配置完redis.service还没有完，redis会操作三个系统文件或目录：

/var/run/redis_6379.pid 存放当前redis进程的进程号，配置：pidfile /var/run/redis_6379.pid

/var/lib/redis/（目录） 存放redis持久化数据库，配置：dir /var/lib/redis

/var/log/redis/redis.log 存放redis运行日志，配置：logfile /var/log/redis/redis.log

需要将/var/run/redis_6379.pid/、/var/lib/redis/目录和/var/log/redis/目录赋予redis用户操作权限

（1）解决redis_6379.pid文件写权限问题

# 根据打印Failed to write PID file: Permission denied[root@iZ8vb45ie77v5ybgcemxysZ ~]# touch /var/run/redis_6379.pid
[root@iZ8vb45ie77v5ybgcemxysZ ~]# chown redis:redis /var/run/redis_6379.pid# 
# #logfile ""
logfile /var/log/redis/redis.log

（2）解决log文件缺失问题

# 根据提示(error) ERR Errors trying to SHUTDOWN. Check logs.
# 先设置log目录权限
chown redis:redis /var/log/redis

修改/etc/redis/redis.conf配置项

# Specify the log file name. Also the empty string can be used to force
# Redis to log on the standard output. Note that if you use standard
# output for logging but daemonize, logs will be sent to /dev/null
#logfile ""logfile /var/log/redis/redis.log

（3）解决db文件写权限问题

# 根据redis.log中的报错
9518:M 20 Mar 2025 12:16:54.936 # Failed opening the temp RDB file temp-9518.rdb (in server root dir /) for saving: Permission denied
9518:M 20 Mar 2025 12:16:54.936 # Error trying to save the DB, can't exit.
9518:M 20 Mar 2025 12:16:54.936 # Errors trying to shut down the server. Check the logs for more information.# 创建相应路径并赋予权限
chown redis:redis /var/lib/redis

修改/etc/redis/redis.conf配置项

# The working directory.
#
# The DB will be written inside this directory, with the filename specified
# above using the 'dbfilename' configuration directive.
#
# The Append Only File will also be created inside this directory.
#
# Note that you must specify a directory here, not a file name.
#dir ./dir /var/lib/redis

[root@iZ8vb45ie77v5ybgcemxysZ ~]# ps -ef|grep redis
redis      898     1  0 11:34 ?        00:00:03 /usr/local/bin/redis-server 0.0.0.0:6379
root      1502  1416  0 11:54 pts/0    00:00:00 grep --color=auto redis
[root@iZ8vb45ie77v5ybgcemxysZ ~]# systemctl status reids
Unit reids.service could not be found.
[root@iZ8vb45ie77v5ybgcemxysZ ~]# systemctl status redis
● redis.service - Redis In-Memory Data StoreLoaded: loaded (/etc/systemd/system/redis.service; enabled; vendor preset: disabled)Active: active (running) since Thu 2025-03-20 11:34:43 CST; 19min agoMain PID: 898 (redis-server)CGroup: /system.slice/redis.service└─898 /usr/local/bin/redis-server 0.0.0.0:6379Mar 20 11:34:43 iZ8vb45ie77v5ybgcemxysZ redis-server[898]: 898:C 20 Mar 2025 11:34:43.508 * Configuration loaded
Mar 20 11:34:43 iZ8vb45ie77v5ybgcemxysZ redis-server[898]: 898:M 20 Mar 2025 11:34:43.509 # You requested maxclients of 10000 requi...ptors.
Mar 20 11:34:43 iZ8vb45ie77v5ybgcemxysZ redis-server[898]: 898:M 20 Mar 2025 11:34:43.509 # Server can't set maximum open files to ...itted.
Mar 20 11:34:43 iZ8vb45ie77v5ybgcemxysZ redis-server[898]: 898:M 20 Mar 2025 11:34:43.509 # Current maximum open files is 4096. max...t -n'.
Mar 20 11:34:43 iZ8vb45ie77v5ybgcemxysZ redis-server[898]: 898:M 20 Mar 2025 11:34:43.509 * monotonic clock: POSIX clock_gettime
Mar 20 11:34:43 iZ8vb45ie77v5ybgcemxysZ redis-server[898]: 898:M 20 Mar 2025 11:34:43.511 # Failed to write PID file: Permission denied
Mar 20 11:34:43 iZ8vb45ie77v5ybgcemxysZ redis-server[898]: 898:M 20 Mar 2025 11:34:43.511 * Running mode=standalone, port=6379.
Mar 20 11:34:43 iZ8vb45ie77v5ybgcemxysZ redis-server[898]: 898:M 20 Mar 2025 11:34:43.511 # WARNING: The TCP backlog setting of 511...f 128.
Mar 20 11:34:43 iZ8vb45ie77v5ybgcemxysZ redis-server[898]: 898:M 20 Mar 2025 11:34:43.514 * Server initialized
Mar 20 11:34:43 iZ8vb45ie77v5ybgcemxysZ redis-server[898]: 898:M 20 Mar 2025 11:34:43.517 * Ready to accept connections tcp
Hint: Some lines were ellipsized, use -l to show in full.
[root@iZ8vb45ie77v5ybgcemxysZ ~]# touch /var/run/redis_6379.pid
[root@iZ8vb45ie77v5ybgcemxysZ ~]# chown redis:redis /var/run/redis_6379                                                                     .pid
[root@iZ8vb45ie77v5ybgcemxysZ ~]# systemctl restart redis
[root@iZ8vb45ie77v5ybgcemxysZ ~]# systemctl status redis
● redis.service - Redis In-Memory Data StoreLoaded: loaded (/etc/systemd/system/redis.service; enabled; vendor preset: disabled)Active: active (running) since Thu 2025-03-20 12:05:30 CST; 1min 12s agoProcess: 5032 ExecStop=/usr/local/bin/redis-cli shutdown (code=exited, status=0/SUCCESS)Main PID: 5575 (redis-server)CGroup: /system.slice/redis.service└─5575 /usr/local/bin/redis-server 0.0.0.0:6379Mar 20 12:05:30 iZ8vb45ie77v5ybgcemxysZ redis-server[5575]: 5575:C 20 Mar 2025 12:05:30.760 * Redis version=7.4.2, bits=64, commit=0...arted
Mar 20 12:05:30 iZ8vb45ie77v5ybgcemxysZ redis-server[5575]: 5575:C 20 Mar 2025 12:05:30.760 * Configuration loaded
Mar 20 12:05:30 iZ8vb45ie77v5ybgcemxysZ redis-server[5575]: 5575:M 20 Mar 2025 12:05:30.760 # You requested maxclients of 10000 requ...tors.
Mar 20 12:05:30 iZ8vb45ie77v5ybgcemxysZ redis-server[5575]: 5575:M 20 Mar 2025 12:05:30.760 # Server can't set maximum open files to...tted.
Mar 20 12:05:30 iZ8vb45ie77v5ybgcemxysZ redis-server[5575]: 5575:M 20 Mar 2025 12:05:30.760 # Current maximum open files is 4096. ma... -n'.
Mar 20 12:05:30 iZ8vb45ie77v5ybgcemxysZ redis-server[5575]: 5575:M 20 Mar 2025 12:05:30.760 * monotonic clock: POSIX clock_gettime
Mar 20 12:05:30 iZ8vb45ie77v5ybgcemxysZ redis-server[5575]: 5575:M 20 Mar 2025 12:05:30.761 * Running mode=standalone, port=6379.
Mar 20 12:05:30 iZ8vb45ie77v5ybgcemxysZ redis-server[5575]: 5575:M 20 Mar 2025 12:05:30.761 # WARNING: The TCP backlog setting of 51... 128.
Mar 20 12:05:30 iZ8vb45ie77v5ybgcemxysZ redis-server[5575]: 5575:M 20 Mar 2025 12:05:30.761 * Server initialized
Mar 20 12:05:30 iZ8vb45ie77v5ybgcemxysZ redis-server[5575]: 5575:M 20 Mar 2025 12:05:30.761 * Ready to accept connections tcp
Hint: Some lines were ellipsized, use -l to show in full.
[root@iZ8vb45ie77v5ybgcemxysZ ~]# ps -ef|grep redis
redis     5575     1  0 12:05 ?        00:00:00 /usr/local/bin/redis-server 0.0.0.0:6379
root      6189  1416  0 12:07 pts/0    00:00:00 grep --color=auto redis
[root@iZ8vb45ie77v5ybgcemxysZ ~]# cat /var/run/redis_6379.pid
5575
[root@iZ8vb45ie77v5ybgcemxysZ ~]# redis-cli shutdown
(error) NOAUTH Authentication required.
[root@iZ8vb45ie77v5ybgcemxysZ ~]# redis-cli -a 1234qwer  shutdown
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
(error) ERR Errors trying to SHUTDOWN. Check logs.
[root@iZ8vb45ie77v5ybgcemxysZ ~]# redis-cli -a 1234qwer  ping
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
PONG
[root@iZ8vb45ie77v5ybgcemxysZ ~]# redis-cli
127.0.0.1:6379> auth
(error) ERR wrong number of arguments for 'auth' command
127.0.0.1:6379> auth 1234qwer
OK
127.0.0.1:6379> ping
PONG
127.0.0.1:6379> SHUTDOWN
(error) ERR Errors trying to SHUTDOWN. Check logs.
127.0.0.1:6379> kill -9 5575
(error) ERR unknown command 'kill', with args beginning with: '-9' '5575'
127.0.0.1:6379> quit
[root@iZ8vb45ie77v5ybgcemxysZ ~]# kill -9 5575
[root@iZ8vb45ie77v5ybgcemxysZ ~]# ps -ef|grep redis
redis     9518     1  0 12:16 ?        00:00:00 /usr/local/bin/redis-server 0.0.0.0:6379
root      9549  1416  0 12:16 pts/0    00:00:00 grep --color=auto redis
[root@iZ8vb45ie77v5ybgcemxysZ ~]# cat /var/run/redis_6379.pid
9518
[root@iZ8vb45ie77v5ybgcemxysZ ~]# redis-cli -a 1234qwer shutdown
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
(error) ERR Errors trying to SHUTDOWN. Check logs.
[root@iZ8vb45ie77v5ybgcemxysZ ~]# kill -9 9518
[root@iZ8vb45ie77v5ybgcemxysZ ~]# ps -ef|grep redis
redis    11057     1  0 12:20 ?        00:00:00 /usr/local/bin/redis-server 0.0.0.0:6379
root     11094  1416  0 12:20 pts/0    00:00:00 grep --color=auto redis
[root@iZ8vb45ie77v5ybgcemxysZ ~]# cat /var/run/redis_6379.pid
11057
[root@iZ8vb45ie77v5ybgcemxysZ ~]# redis-cli shutdown
(error) NOAUTH Authentication required.
[root@iZ8vb45ie77v5ybgcemxysZ ~]# redis-cli -a 1234qwer  shutdown
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
[root@iZ8vb45ie77v5ybgcemxysZ ~]# ps -ef|grep redis
redis    11240     1  0 12:20 ?        00:00:00 /usr/local/bin/redis-server 0.0.0.0:6379
root     11289  1416  0 12:21 pts/0    00:00:00 grep --color=auto redis
[root@iZ8vb45ie77v5ybgcemxysZ ~]# systemctl daemon-reload
[root@iZ8vb45ie77v5ybgcemxysZ ~]# systemctl stop redis
[root@iZ8vb45ie77v5ybgcemxysZ ~]# systemctl status redis
● redis.service - Redis In-Memory Data StoreLoaded: loaded (/etc/systemd/system/redis.service; enabled; vendor preset: disabled)Active: inactive (dead) since Thu 2025-03-20 12:23:14 CST; 5s agoProcess: 12130 ExecStop=/usr/local/bin/redis-cli -a 1234qwer  shutdown (code=exited, status=0/SUCCESS)Process: 11240 ExecStart=/usr/local/bin/redis-server /etc/redis/redis.conf (code=exited, status=0/SUCCESS)Main PID: 11240 (code=exited, status=0/SUCCESS)Mar 20 12:20:54 iZ8vb45ie77v5ybgcemxysZ systemd[1]: Started Redis In-Memory Data Store.
Mar 20 12:23:14 iZ8vb45ie77v5ybgcemxysZ systemd[1]: Stopping Redis In-Memory Data Store...
Mar 20 12:23:14 iZ8vb45ie77v5ybgcemxysZ redis-cli[12130]: Warning: Using a password with '-a' or '-u' option on the command line in... safe.
Mar 20 12:23:14 iZ8vb45ie77v5ybgcemxysZ systemd[1]: Stopped Redis In-Memory Data Store.
Hint: Some lines were ellipsized, use -l to show in full.
[root@iZ8vb45ie77v5ybgcemxysZ ~]# ps -ef|grep redis
root     12196  1416  0 12:23 pts/0    00:00:00 grep --color=auto redis
[root@iZ8vb45ie77v5ybgcemxysZ ~]# systemctl start redis
[root@iZ8vb45ie77v5ybgcemxysZ ~]# systemctl status redis
● redis.service - Redis In-Memory Data StoreLoaded: loaded (/etc/systemd/system/redis.service; enabled; vendor preset: disabled)Active: active (running) since Thu 2025-03-20 12:23:31 CST; 4s agoProcess: 12130 ExecStop=/usr/local/bin/redis-cli -a 1234qwer  shutdown (code=exited, status=0/SUCCESS)Main PID: 12239 (redis-server)CGroup: /system.slice/redis.service└─12239 /usr/local/bin/redis-server 0.0.0.0:6379Mar 20 12:23:31 iZ8vb45ie77v5ybgcemxysZ systemd[1]: Started Redis In-Memory Data Store.
[root@iZ8vb45ie77v5ybgcemxysZ ~]# systemctl restart redis
[root@iZ8vb45ie77v5ybgcemxysZ ~]# ps -ef|grep redis
redis    12368     1  0 12:23 ?        00:00:00 /usr/local/bin/redis-server 0.0.0.0:6379
root     12423  1416  0 12:23 pts/0    00:00:00 grep --color=auto redis
[root@iZ8vb45ie77v5ybgcemxysZ ~]# systemctl restart redis
[root@iZ8vb45ie77v5ybgcemxysZ ~]# ps -ef|grep redis
redis    12456     1  0 12:24 ?        00:00:00 /usr/local/bin/redis-server 0.0.0.0:6379
root     12475  1416  0 12:24 pts/0    00:00:00 grep --color=auto redis
[root@iZ8vb45ie77v5ybgcemxysZ ~]#

（4）解决内存过度分配（Memory Overcommit）未启用问题

11057:C 20 Mar 2025 12:20:26.509 # WARNING Memory overcommit must be enabled! Without it, a background save or replication may fail under low memory condition. Being disabled, it can also cause failures without low memory condition, see https://github.com/jemalloc/jemalloc/issues/1328. 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.

从日志信息来看，Redis 提示 内存过度分配（Memory Overcommit）未启用，这可能会导致在低内存条件下后台保存（RDB 快照）或复制失败。Redis 建议启用内存过度分配以避免此类问题。

---

什么是内存过度分配（Memory Overcommit）？

内存过度分配是 Linux 内核的一种机制，允许系统分配比实际物理内存更多的内存。Redis 依赖于这种机制来确保在内存不足时仍能正常工作（例如，执行 RDB 快照或复制操作）。

默认情况下，Linux 内核的内存过度分配策略可能是保守的（vm.overcommit_memory = 0），这会导致 Redis 在某些情况下无法分配足够的内存。

为了永久启用内存过度分配，需要修改 /etc/sysctl.conf 文件：

1. 打开 /etc/sysctl.conf 文件：

sudo vi /etc/sysctl.conf

2. 在文件末尾添加以下内容：

vm.overcommit_memory = 1

3. 保存并退出编辑器。

4. 应用更改：

sudo sysctl -p

（5） TCP 连接队列的最大长度（即 backlog 队列）不足问题，提高系统并发性能

31867:M 20 Mar 2025 13:18:00.467 # WARNING: The TCP backlog setting of 511 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 128.

这个警告信息表明 Redis 在启动时尝试设置 TCP 连接的 backlog 参数为 511，但操作系统内核的 /proc/sys/net/core/somaxconn 参数值被设置为 128，低于 Redis 的配置值，因此 Redis 无法生效其配置。

:::

什么是 backlog？

backlog 是 TCP 连接队列的长度，用于存储等待被 Redis 接受的客户端连接。如果连接请求的数量超过了 backlog 的值，新的连接请求可能会被拒绝。

Redis 默认的 backlog 值是 511。

操作系统内核的 somaxconn 参数限制了 backlog 的最大值。
:::
:::

什么是 **somaxconn**？

net.core.somaxconn 是 Linux 内核参数，用于控制 TCP 连接队列的最大长度（即 backlog 队列）。当客户端尝试连接到服务器时，如果服务器正在处理其他连接，新的连接请求会被放入 backlog 队列中，等待服务器接受。

默认值通常是 128。

如果 backlog 队列已满，新的连接请求会被拒绝，客户端可能会收到 Connection refused 或超时错误。
:::

永久设置

1. 编辑 /etc/sysctl.conf 文件：

sudo nano /etc/sysctl.conf

2. 添加或修改以下行：

net.core.somaxconn=1024

3. 保存并退出，然后应用更改：

sudo sysctl -p

4. 验证修改：

cat /proc/sys/net/core/somaxconn

centos操作命令

[root@iZ8vb45ie77v5ybgcemxysZ ~]# ps -ef|grep redis
redis      898     1  0 11:34 ?        00:00:03 /usr/local/bin/redis-server 0.0.0.0:6379
root      1502  1416  0 11:54 pts/0    00:00:00 grep --color=auto redis
[root@iZ8vb45ie77v5ybgcemxysZ ~]# systemctl status reids
Unit reids.service could not be found.
[root@iZ8vb45ie77v5ybgcemxysZ ~]# systemctl status redis
● redis.service - Redis In-Memory Data StoreLoaded: loaded (/etc/systemd/system/redis.service; enabled; vendor preset: disabled)Active: active (running) since Thu 2025-03-20 11:34:43 CST; 19min agoMain PID: 898 (redis-server)CGroup: /system.slice/redis.service└─898 /usr/local/bin/redis-server 0.0.0.0:6379Mar 20 11:34:43 iZ8vb45ie77v5ybgcemxysZ redis-server[898]: 898:C 20 Mar 2025 11:34:43.508 * Configuration loaded
Mar 20 11:34:43 iZ8vb45ie77v5ybgcemxysZ redis-server[898]: 898:M 20 Mar 2025 11:34:43.509 # You requested maxclients of 10000 requi...ptors.
Mar 20 11:34:43 iZ8vb45ie77v5ybgcemxysZ redis-server[898]: 898:M 20 Mar 2025 11:34:43.509 # Server can't set maximum open files to ...itted.
Mar 20 11:34:43 iZ8vb45ie77v5ybgcemxysZ redis-server[898]: 898:M 20 Mar 2025 11:34:43.509 # Current maximum open files is 4096. max...t -n'.
Mar 20 11:34:43 iZ8vb45ie77v5ybgcemxysZ redis-server[898]: 898:M 20 Mar 2025 11:34:43.509 * monotonic clock: POSIX clock_gettime
Mar 20 11:34:43 iZ8vb45ie77v5ybgcemxysZ redis-server[898]: 898:M 20 Mar 2025 11:34:43.511 # Failed to write PID file: Permission denied
Mar 20 11:34:43 iZ8vb45ie77v5ybgcemxysZ redis-server[898]: 898:M 20 Mar 2025 11:34:43.511 * Running mode=standalone, port=6379.
Mar 20 11:34:43 iZ8vb45ie77v5ybgcemxysZ redis-server[898]: 898:M 20 Mar 2025 11:34:43.511 # WARNING: The TCP backlog setting of 511...f 128.
Mar 20 11:34:43 iZ8vb45ie77v5ybgcemxysZ redis-server[898]: 898:M 20 Mar 2025 11:34:43.514 * Server initialized
Mar 20 11:34:43 iZ8vb45ie77v5ybgcemxysZ redis-server[898]: 898:M 20 Mar 2025 11:34:43.517 * Ready to accept connections tcp
Hint: Some lines were ellipsized, use -l to show in full.
[root@iZ8vb45ie77v5ybgcemxysZ ~]# touch /var/run/redis_6379.pid
[root@iZ8vb45ie77v5ybgcemxysZ ~]# chown redis:redis /var/run/redis_6379                                                                                      .pid
[root@iZ8vb45ie77v5ybgcemxysZ ~]# systemctl restart redis
[root@iZ8vb45ie77v5ybgcemxysZ ~]# systemctl status redis
● redis.service - Redis In-Memory Data StoreLoaded: loaded (/etc/systemd/system/redis.service; enabled; vendor preset: disabled)Active: active (running) since Thu 2025-03-20 12:05:30 CST; 1min 12s agoProcess: 5032 ExecStop=/usr/local/bin/redis-cli shutdown (code=exited, status=0/SUCCESS)Main PID: 5575 (redis-server)CGroup: /system.slice/redis.service└─5575 /usr/local/bin/redis-server 0.0.0.0:6379Mar 20 12:05:30 iZ8vb45ie77v5ybgcemxysZ redis-server[5575]: 5575:C 20 Mar 2025 12:05:30.760 * Redis version=7.4.2, bits=64, commit=0...arted
Mar 20 12:05:30 iZ8vb45ie77v5ybgcemxysZ redis-server[5575]: 5575:C 20 Mar 2025 12:05:30.760 * Configuration loaded
Mar 20 12:05:30 iZ8vb45ie77v5ybgcemxysZ redis-server[5575]: 5575:M 20 Mar 2025 12:05:30.760 # You requested maxclients of 10000 requ...tors.
Mar 20 12:05:30 iZ8vb45ie77v5ybgcemxysZ redis-server[5575]: 5575:M 20 Mar 2025 12:05:30.760 # Server can't set maximum open files to...tted.
Mar 20 12:05:30 iZ8vb45ie77v5ybgcemxysZ redis-server[5575]: 5575:M 20 Mar 2025 12:05:30.760 # Current maximum open files is 4096. ma... -n'.
Mar 20 12:05:30 iZ8vb45ie77v5ybgcemxysZ redis-server[5575]: 5575:M 20 Mar 2025 12:05:30.760 * monotonic clock: POSIX clock_gettime
Mar 20 12:05:30 iZ8vb45ie77v5ybgcemxysZ redis-server[5575]: 5575:M 20 Mar 2025 12:05:30.761 * Running mode=standalone, port=6379.
Mar 20 12:05:30 iZ8vb45ie77v5ybgcemxysZ redis-server[5575]: 5575:M 20 Mar 2025 12:05:30.761 # WARNING: The TCP backlog setting of 51... 128.
Mar 20 12:05:30 iZ8vb45ie77v5ybgcemxysZ redis-server[5575]: 5575:M 20 Mar 2025 12:05:30.761 * Server initialized
Mar 20 12:05:30 iZ8vb45ie77v5ybgcemxysZ redis-server[5575]: 5575:M 20 Mar 2025 12:05:30.761 * Ready to accept connections tcp
Hint: Some lines were ellipsized, use -l to show in full.
[root@iZ8vb45ie77v5ybgcemxysZ ~]# ps -ef|grep redis
redis     5575     1  0 12:05 ?        00:00:00 /usr/local/bin/redis-server 0.0.0.0:6379
root      6189  1416  0 12:07 pts/0    00:00:00 grep --color=auto redis
[root@iZ8vb45ie77v5ybgcemxysZ ~]# cat /var/run/redis_6379.pid
5575
[root@iZ8vb45ie77v5ybgcemxysZ ~]# redis-cli shutdown
(error) NOAUTH Authentication required.
[root@iZ8vb45ie77v5ybgcemxysZ ~]# redis-cli -a 1234qwer  shutdown
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
(error) ERR Errors trying to SHUTDOWN. Check logs.
[root@iZ8vb45ie77v5ybgcemxysZ ~]# redis-cli -a 1234qwer  ping
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
PONG
[root@iZ8vb45ie77v5ybgcemxysZ ~]# redis-cli
127.0.0.1:6379> auth
(error) ERR wrong number of arguments for 'auth' command
127.0.0.1:6379> auth 1234qwer
OK
127.0.0.1:6379> ping
PONG
127.0.0.1:6379> SHUTDOWN
(error) ERR Errors trying to SHUTDOWN. Check logs.
127.0.0.1:6379> kill -9 5575
(error) ERR unknown command 'kill', with args beginning with: '-9' '5575'
127.0.0.1:6379> quit
[root@iZ8vb45ie77v5ybgcemxysZ ~]# kill -9 5575
[root@iZ8vb45ie77v5ybgcemxysZ ~]# ps -ef|grep redis
redis     9518     1  0 12:16 ?        00:00:00 /usr/local/bin/redis-server 0.0.0.0:6379
root      9549  1416  0 12:16 pts/0    00:00:00 grep --color=auto redis
[root@iZ8vb45ie77v5ybgcemxysZ ~]# cat /var/run/redis_6379.pid
9518
[root@iZ8vb45ie77v5ybgcemxysZ ~]# redis-cli -a 1234qwer  shutdown
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
(error) ERR Errors trying to SHUTDOWN. Check logs.
[root@iZ8vb45ie77v5ybgcemxysZ ~]# kill -9 9518
[root@iZ8vb45ie77v5ybgcemxysZ ~]# ps -ef|grep redis
redis    11057     1  0 12:20 ?        00:00:00 /usr/local/bin/redis-server 0.0.0.0:6379
root     11094  1416  0 12:20 pts/0    00:00:00 grep --color=auto redis
[root@iZ8vb45ie77v5ybgcemxysZ ~]# cat /var/run/redis_6379.pid
11057
[root@iZ8vb45ie77v5ybgcemxysZ ~]# redis-cli shutdown
(error) NOAUTH Authentication required.
[root@iZ8vb45ie77v5ybgcemxysZ ~]# redis-cli -a 1234qwer  shutdown
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
[root@iZ8vb45ie77v5ybgcemxysZ ~]# ps -ef|grep redis
redis    11240     1  0 12:20 ?        00:00:00 /usr/local/bin/redis-server 0.0.0.0:6379
root     11289  1416  0 12:21 pts/0    00:00:00 grep --color=auto redis
[root@iZ8vb45ie77v5ybgcemxysZ ~]# systemctl daemon-reload
[root@iZ8vb45ie77v5ybgcemxysZ ~]# systemctl stop redis
[root@iZ8vb45ie77v5ybgcemxysZ ~]# systemctl status redis
● redis.service - Redis In-Memory Data StoreLoaded: loaded (/etc/systemd/system/redis.service; enabled; vendor preset: disabled)Active: inactive (dead) since Thu 2025-03-20 12:23:14 CST; 5s agoProcess: 12130 ExecStop=/usr/local/bin/redis-cli -a 1234qwer  shutdown (code=exited, status=0/SUCCESS)Process: 11240 ExecStart=/usr/local/bin/redis-server /etc/redis/redis.conf (code=exited, status=0/SUCCESS)Main PID: 11240 (code=exited, status=0/SUCCESS)Mar 20 12:20:54 iZ8vb45ie77v5ybgcemxysZ systemd[1]: Started Redis In-Memory Data Store.
Mar 20 12:23:14 iZ8vb45ie77v5ybgcemxysZ systemd[1]: Stopping Redis In-Memory Data Store...
Mar 20 12:23:14 iZ8vb45ie77v5ybgcemxysZ redis-cli[12130]: Warning: Using a password with '-a' or '-u' option on the command line in... safe.
Mar 20 12:23:14 iZ8vb45ie77v5ybgcemxysZ systemd[1]: Stopped Redis In-Memory Data Store.
Hint: Some lines were ellipsized, use -l to show in full.
[root@iZ8vb45ie77v5ybgcemxysZ ~]# ps -ef|grep redis
root     12196  1416  0 12:23 pts/0    00:00:00 grep --color=auto redis
[root@iZ8vb45ie77v5ybgcemxysZ ~]# systemctl start redis
[root@iZ8vb45ie77v5ybgcemxysZ ~]# systemctl status redis
● redis.service - Redis In-Memory Data StoreLoaded: loaded (/etc/systemd/system/redis.service; enabled; vendor preset: disabled)Active: active (running) since Thu 2025-03-20 12:23:31 CST; 4s agoProcess: 12130 ExecStop=/usr/local/bin/redis-cli -a 1234qwer  shutdown (code=exited, status=0/SUCCESS)Main PID: 12239 (redis-server)CGroup: /system.slice/redis.service└─12239 /usr/local/bin/redis-server 0.0.0.0:6379Mar 20 12:23:31 iZ8vb45ie77v5ybgcemxysZ systemd[1]: Started Redis In-Memory Data Store.
[root@iZ8vb45ie77v5ybgcemxysZ ~]# systemctl restart redis
[root@iZ8vb45ie77v5ybgcemxysZ ~]# ps -ef|grep redis
redis    12368     1  0 12:23 ?        00:00:00 /usr/local/bin/redis-server 0.0.0.0:6379
root     12423  1416  0 12:23 pts/0    00:00:00 grep --color=auto redis
[root@iZ8vb45ie77v5ybgcemxysZ ~]# systemctl restart redis
[root@iZ8vb45ie77v5ybgcemxysZ ~]# ps -ef|grep redis
redis    12456     1  0 12:24 ?        00:00:00 /usr/local/bin/redis-server 0.0.0.0:6379
root     12475  1416  0 12:24 pts/0    00:00:00 grep --color=auto redis
[root@iZ8vb45ie77v5ybgcemxysZ ~]# sysctl -p
vm.swappiness = 0
kernel.sysrq = 1
net.ipv4.neigh.default.gc_stale_time = 120
net.ipv4.conf.all.rp_filter = 0
net.ipv4.conf.default.rp_filter = 0
net.ipv4.conf.default.arp_announce = 2
net.ipv4.conf.lo.arp_announce = 2
net.ipv4.conf.all.arp_announce = 2
net.ipv4.tcp_max_tw_buckets = 5000
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_max_syn_backlog = 1024
net.ipv4.tcp_synack_retries = 2
net.ipv4.tcp_slow_start_after_idle = 0
vm.overcommit_memory = 1
[root@iZ8vb45ie77v5ybgcemxysZ ~]# systemctl restart redis
[root@iZ8vb45ie77v5ybgcemxysZ ~]# sysctl -p
vm.swappiness = 0
kernel.sysrq = 1
net.ipv4.neigh.default.gc_stale_time = 120
net.ipv4.conf.all.rp_filter = 0
net.ipv4.conf.default.rp_filter = 0
net.ipv4.conf.default.arp_announce = 2
net.ipv4.conf.lo.arp_announce = 2
net.ipv4.conf.all.arp_announce = 2
net.ipv4.tcp_max_tw_buckets = 5000
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_max_syn_backlog = 1024
net.ipv4.tcp_synack_retries = 2
net.ipv4.tcp_slow_start_after_idle = 0
vm.overcommit_memory = 1
net.core.somaxconn = 1024
[root@iZ8vb45ie77v5ybgcemxysZ ~]# cat /proc/sys/net/core/somaxconn
1024
[root@iZ8vb45ie77v5ybgcemxysZ ~]# systemctl restart redis
[root@iZ8vb45ie77v5ybgcemxysZ ~]#