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ubuntu18安装redis后未开机启动Could not connect to Redis at 127.0.0.1:6379: Connection refused解决办法

阿里云ubuntu18安装redis后,
apt install redis-server
redis-cli提示Could not connect to Redis at 127.0.0.1:6379: Connection refused
最终发现是两方面导致:
1. ubuntu18未将redis加入到systemctl中
sudo systemctl enable redis-server.service

2.redis默认监听了ipv6导致启动失败
sudo vim /etc/redis/redis.conf
将bind 127.0.0.1 ::1
修改为bind 127.0.0.1

reboot
-----------------------------------------------------------------
另新安装的redis会有三个报错信息
1.The TCP backlog setting of 511 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 128.
意思是:TCP backlog设置值,511没有成功,因为 /proc/sys/net/core/somaxconn这个设置的是更小的128.
临时解决方法:(即下次启动还需要修改此值)
echo 511 > /proc/sys/net/core/somaxconn
永久解决方法:(即以后启动还需要修改此值)
将其写入/etc/rc.local文件中。
2.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.
意思是:overcommit_memory参数设置为0!在内存不足的情况下,后台程序save可能失败。建议在文件 /etc/sysctl.conf 中将overcommit_memory修改为1。
临时解决方法:echo "vm.overcommit_memory=1" >> /etc/sysctl.conf
永久解决方法:将其写入/etc/sysctl.conf文件中。
3.you have Transparent Huge Pages (THP) support enabled in your kernel. This will create latency and memory usage issues with Redis. To fix thisissue run the command 'echo never > /sys/kernel/mm/transparent_hugepage/enabled' as root, and add it to your /etc/rc.local in order to retain thesetting after a reboot. Redis must be restarted after THP is disabled.
意思是:你使用的是透明大页,可能导致redis延迟和内存使用问题。执行 echo never > /sys/kernel/mm/transparent_hugepage/enabled 修复该问题。
临时解决方法:
echo never > /sys/kernel/mm/transparent_hugepage/enabled。
永久解决方法:
将其写入/etc/rc.local文件中。
另附rc.local写法
写法1
sudo vim /etc/rc.local
#!/bin/sh -e
echo never > /sys/kernel/mm/transparent_hugepage/enabled
echo 511 > /proc/sys/net/core/somaxconn:x保存
写法2
echo '#!/bin/sh -e' >>/etc/rc.local
echo 'echo never > /sys/kernel/mm/transparent_hugepage/enabled' >>/etc/rc.local
echo 'echo 511 > /proc/sys/net/core/somaxconn' >>/etc/rc.local

最后
sudo chmod 777 /etc/rc.local
reboot
即可

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