mysqld被自己杀死了

Question

我不知道是什么进程杀死了它。我在 CentOS 的经验为零。首先它没有开始使用

service mysqld start

并显示错误

/usr/bin/mysqld_safe: line 183:  7618 Killed                  nohup /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib64/mysql/plugin --user=mysql --log-error=/var/log/mysqld.log --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/lib/mysql/mysql.sock < /dev/null > /dev/null 2>&1
/usr/bin/mysqld_safe: line 183:  7675 Killed                  nohup /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib64/mysql/plugin --user=mysql --log-error=/var/log/mysqld.log --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/lib/mysql/mysql.sock < /dev/null > /dev/null 2>&1 > /dev/null 2>&1

所以我在某处阅读以运行以下命令

sudo service httpd restart

然后mysqld正常启动，但在10-15秒内又出现上述错误。我认为某些进程正在强行杀死它。

这里是mysqld.log

Version: '5.6.38'  socket: '/var/lib/mysql/mysql.sock'  port: 3306  MySQL Community Server (GPL)
2017-11-14 12:02:07 1535 [Note] Plugin 'FEDERATED' is disabled.
2017-11-14 12:02:07 1535 [Note] InnoDB: Using atomics to ref count buffer pool pages
2017-11-14 12:02:07 1535 [Note] InnoDB: The InnoDB memory heap is disabled
2017-11-14 12:02:07 1535 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2017-11-14 12:02:07 1535 [Note] InnoDB: Memory barrier is not used
2017-11-14 12:02:07 1535 [Note] InnoDB: Compressed tables use zlib 1.2.3
2017-11-14 12:02:07 1535 [Note] InnoDB: Using Linux native AIO
2017-11-14 12:02:07 1535 [Note] InnoDB: Using CPU crc32 instructions
2017-11-14 12:02:07 1535 [Note] InnoDB: Initializing buffer pool, size = 128.0M
2017-11-14 12:02:07 1535 [Note] InnoDB: Completed initialization of buffer pool

命令free -m 显示下面的输出以防万一。

             total       used       free     shared    buffers     cached
Mem:           512        280        231        128          0          7
-/+ buffers/cache:        272        239
Swap:          256        207         48

下面是我的my.cnf 文件。

[mysqld]
bind_address = 0.0.0.0
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
user=mysql

thread_cache_size=4

join_buffer_size=4M
sort_buffer_size=4M
read_buffer_size=4M
read_rnd_buffer_size=6M

myisam_sort_buffer_size=64M

key_buffer_size=128M
tmp_table_size=128M
max_heap_table_size=128M
query_cache_size=256M

query_cache_type=1
default-storage-engine=myisam
#skip-innodb



[mysqld_safe]
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid

导致该错误和杀死 mysqld 的原因是什么，我该如何解决？

Answer 1

最后发现问题出在物理主存不足。

增加主内存解决了我的问题。