问题现象一：先启动Tomcat，再启动MySQL，Tomcat服务自动shutdown
问题现象二：先启动MySQL，再启动Tomcat，MySQL服务自动shutdown
报错如下：
[root@iz2ze2q8e0xhao9pcnm0qxz apache-tomcat-7.0.82]# /usr/local/mysql/bin/mysqld_safe
180409 18:28:41 mysqld_safe Logging to '/usr/local/mysql/data/iz2ze2q8e0xhao9pcnm0qxz.err'.
180409 18:28:41 mysqld_safe Starting mysqld daemon with databases from /usr/local/mysql/data
/usr/local/mysql/bin/mysqld_safe: 行 183: 582 已杀死 nohup /usr/local/mysql/bin/mysqld --basedir=/usr/local/mysql --datadir=/usr/local/mysql/data --plugin-dir=/usr/local/mysql/lib/plugin --user=mysql --log-error=iz2ze2q8e0xhao9pcnm0qxz.err --pid-file=iz2ze2q8e0xhao9pcnm0qxz.pid < /dev/null > /dev/null 2>&1
解决方法：在my.cnf中增加内存配置，可以完美解决问题
key_buffer=16K
table_open_cache=4
query_cache_limit=256K
query_cache_size=4M
max_allowed_packet=1M
sort_buffer_size=64K
read_buffer_size=256K
thread_stack=64K
innodb_buffer_pool_size = 56M
PS：购买的Ali ECS 1G内存的云主机，因为内存太小，服务彼此竞争资源而导致的。
