远程Mysql连接Navicat连接远程mycat报错ERROR 2003 (HY000): Can't connect to MySQL server on x.x.x.x

墨蓝 2022-03-25 04:58 907阅读 0赞

今天 linux 系统下做了 mycat 的数据库分片，虚拟机启动 mycat 服务后，win7 下远程连接 mycat。

发现 mycat 启动以后使用 Navicat for mysql 连接报了下列错误

ERROR 2003 (HY000): Can't connect to MySQL server on x.x.x.x

于是回去看了一下mycat的服务居然自动挂了

./mycat status

看了一下mycat的日志

./mycat console

出现下列信息

wrapper  | --> Wrapper Started as Console
    wrapper  | Launching a JVM...
    wrapper  | JVM exited while loading the application.
    jvm 1    | OpenJDK 64-Bit Server VM warning: ignoring option MaxPermSize=64M; support was removed in 8.0
    jvm 1    | OpenJDK 64-Bit Server VM warning: INFO: os::commit_memory(0x00000000aaaa0000, 1431699456, 0) failed; error='Cannot allocate memory' (errno=12)
    jvm 1    | #
    jvm 1    | # There is insufficient memory for the Java Runtime Environment to continue.
    jvm 1    | # Native memory allocation (mmap) failed to map 1431699456 bytes for committing reserved memory.
    jvm 1    | # An error report file with more information is saved as:
    jvm 1    | # /usr/local/mycat/hs_err_pid49051.log
    wrapper  | Launching a JVM...
    wrapper  | JVM exited while loading the application.

翻译了一下大概说是jvm没法分配内存了

于是去度娘了一下！

发现网上说需要开启系统的 Over-commit，跳过系统的可用内存检查直接分配。

为了避免重启服务器以后  搭建的zk集群solr集群redis集群  需要重新启动

执行了临时操作

临时更改： echo 1 > /proc/sys/vm/overcommit\_memory

永久更改： 编辑 /etc/sysctl.conf，修改参数 vm.overcommit\_memory = 1，重启服务器或者用户重新登录

执行完以后发现Navicat可以正常连接mycat的端口了

记录每一个坑！

参考： [http://www.cnblogs.com/rabbitpei/p/6738671.html][http_www.cnblogs.com_rabbitpei_p_6738671.html]

[http_www.cnblogs.com_rabbitpei_p_6738671.html]: http://www.cnblogs.com/rabbitpei/p/6738671.html