linux中nginx、mysql安装碰到的问题

服务器到期新买了一台服务器，记录一下重新安装基本环境碰到了一些问题

安装nginx

1. 启动失败

403 forbidden nginx

解决方案：（个人使用直接用了root账号，修改对应nginx启动用户）

• vi conf/nginx.conf
• user 改成对应用户

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2. 重启失败

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/var/log/nginx 日志文件： nginx: [emerg] bind() to [::]:80 failed (98: Address already in use) nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use) nginx: [emerg] bind() to 0.0.0.0:443 failed (98: Address already in use) nginx: [emerg] bind() to [::]:80 failed (98: Address already in use) nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use) nginx: [emerg] bind() to 0.0.0.0:443 failed (98: Address already in use) nginx: [emerg] bind() to [::]:80 failed (98: Address already in use) nginx: [emerg] still could not bind()

解决方案：杀死80端口nginx程序重新启动：

• lsof -i :80 （发现是nginx在占用）
• kill [pid]

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mysql启动卡在启动命令、或者InnoDB: mmap(137363456 bytes) failed; errno 12

一半是内存过小，centos没有设置swap分区可以通过swap解决

大专栏  linux中nginx、mysql安装碰到的问题> 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

cat /var/log/mysqld.log 日志： 2019-01-14 23:13:29 6051 [Note] InnoDB: Using atomics to ref count buffer pool pages 2019-01-14 23:13:29 6051 [Note] InnoDB: The InnoDB memory heap is disabled 2019-01-14 23:13:29 6051 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins 2019-01-14 23:13:29 6051 [Note] InnoDB: Memory barrier is not used 2019-01-14 23:13:29 6051 [Note] InnoDB: Compressed tables use zlib 1.2.11 2019-01-14 23:13:29 6051 [Note] InnoDB: Using Linux native AIO 2019-01-14 23:13:29 6051 [Note] InnoDB: Using CPU crc32 instructions 2019-01-14 23:13:29 6051 [Note] InnoDB: Initializing buffer pool, size = 128.0M InnoDB: mmap(137363456 bytes) failed; errno 12 2019-01-14 23:13:29 6051 [ERROR] InnoDB: Cannot allocate memory for the buffer pool 2019-01-14 23:13:29 6051 [ERROR] Plugin 'InnoDB' init function returned error. 2019-01-14 23:13:29 6051 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed. 2019-01-14 23:13:29 6051 [ERROR] Unknown/unsupported storage engine: InnoDB 2019-01-14 23:13:29 6051 [ERROR] Aborting

解决方案：(以下是网上答案)

• dd if=/dev/zero of=/swap bs=1M count=512 # 创建一个swap文件，大小为512M
• mkswap /swap # 将swap文件变为swap分区文件

• swapon /swap # 将其映射为swap分区

• vi /etc/fstab # 在其中添加如下一行
  /swap swap swap defaults 0 0