达梦数据库系列:达梦:网络通信异常排查方法




达梦:网络通信异常排查方法

1.网络通信异常

在这里插入图片描述

排查方法:

1). 确定连接的ip地址、数据库端口号、数据库用户名、用户密码输入正确无误
2).确定网络正常
ping 192.168.11.1
3).确定数据库端口正常
#语法 telnet ip port_num
telnet 192.168.11.1 5236
4).确定防火墙关闭或者数据库已开放数据库使用的端口

查看防火墙状态

systenctl status firewalld.service

查看服务器开放的端口

待补充

5).确定是否是句柄资源限制导致的连接无法创建
 确定/etc/security/limits.conf中open files是否设置为65536

[root@localhost security]# ulimit -a
core file size          (blocks, -c) 0
data seg size           (kbytes, -d) unlimited
scheduling priority             (-e) 0
file size               (blocks, -f) unlimited
pending signals                 (-i) 30518
max locked memory       (kbytes, -l) 64
max memory size         (kbytes, -m) unlimited
open files                      (-n) 1024
pipe size            (512 bytes, -p) 8
POSIX message queues     (bytes, -q) 819200
real-time priority              (-r) 0
stack size              (kbytes, -s) 10240
cpu time               (seconds, -t) unlimited
max user processes              (-u) 1024
virtual memory          (kbytes, -v) unlimited
file locks                      (-x) unlimited
[root@localhost security]# ulimit -n 10240
[root@localhost security]# ulimit -a
core file size          (blocks, -c) 0
data seg size           (kbytes, -d) unlimited
scheduling priority             (-e) 0
file size               (blocks, -f) unlimited
pending signals                 (-i) 30518
max locked memory       (kbytes, -l) 64
max memory size         (kbytes, -m) unlimited
open files                      (-n) 10240
pipe size            (512 bytes, -p) 8
POSIX message queues     (bytes, -q) 819200
real-time priority              (-r) 0
stack size              (kbytes, -s) 10240
cpu time               (seconds, -t) unlimited
max user processes              (-u) 1024
virtual memory          (kbytes, -v) unlimited
file locks                      (-x) unlimited
6).确定内存资源限制情况







小虾米vivian

达梦:网络通信异常排查方法

posted @ 2024-06-19 12:36  坦笑&&life  阅读(8)  评论(0编辑  收藏  举报  来源