备份/opt和network-scripts/
重装系统
1.修改ifconfig
2.修改ssh端口
vi /etc/ssh/sshd_config找到“#Port 22”，这一行直接键入“yyp”复制该行到下一行，然后把两行的“#”号即注释去掉，修改成：
Port 22 Port 10086SSH默认监听端口是22，如果你不强制说明别的端口，”Port 22”注不注释都是开放22访问端口 3.关闭防火墙
service firewall stop
4.连接，查看修改openfile
ulimit -a
[root@dm8_dw1 cpt01]# 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) 7177 max locked memory (kbytes, -l) 64 max memory size (kbytes, -m) unlimited open files (-n) 65536 pipe size (512 bytes, -p) 8 POSIX message queues (bytes, -q) 819200 real-time priority (-r) 0 stack size (kbytes, -s) 8192 cpu time (seconds, -t) unlimited max user processes (-u) 7177 virtual memory (kbytes, -v) unlimited file locks (-x) unlimited vi /etc/security/limits.conf加入
soft no file 65536 hard no file 65536 soft noproc 10240 hard noproc 102405.挂载硬盘
blkid
[root@dm8_dw1 cpt01]# blkid /dev/sda1: UUID="9ca71feb-d9f1-4c48-b2d8-be1c60ffa590" TYPE="xfs" /dev/sda2: UUID="Cp2cm2-uHAO-GKhz-sMrV-Y3HE-UeTM-WiEWTS" TYPE="LVM2_member" /dev/sr0: UUID="2015-12-09-23-14-10-00" LABEL="CentOS 7 x86_64" TYPE="iso9660" PTTYPE="dos" /dev/mapper/centos-root: UUID="3180a897-0292-432f-a0d8-2dbf760bec2c" TYPE="xfs" /dev/mapper/centos-swap: UUID="9540990f-815e-4324-8b0b-be4f646cdd50" TYPE="swap" /dev/loop0: UUID="2020-04-29-17-22-00-00" LABEL="M-fM-^VM-0M-eM-;M-:" TYPE="iso9660"复制要添加硬盘的UUID的值，不带引号
vi /etc/fstab写入 UUID=复制的值 /data ext4 defaults 0 0 wq保存退出
# # /etc/fstab # Created by anaconda on Sun Aug 9 02:56:53 2020 # # Accessible filesystems, by reference, are maintained under '/dev/disk' # See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info # /dev/mapper/centos-root / xfs defaults 0 0 UUID=9ca71feb-d9f1-4c48-b2d8-be1c60ffa590 /boot xfs defaults 0 0 /dev/mapper/centos-swap swap swap defaults 0 06.重启 reboot重启 ulimit -a查看openfile; df -h查看硬盘是否挂载成功
[root@dm8_dw1 cpt01]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/centos-root 196G 7.6G 189G 4% / devtmpfs 898M 0 898M 0% /dev tmpfs 913M 284K 913M 1% /dev/shm tmpfs 913M 9.1M 904M 1% /run tmpfs 913M 0 913M 0% /sys/fs/cgroup /dev/sda1 397M 153M 245M 39% /boot tmpfs 183M 28K 183M 1% /run/user/0 /dev/loop0 620M 620M 0 100% /dm_install /dev/sr0 4.1G 4.1G 0 100% /run/media/root/CentOS 7 x86_64 tmpfs 183M 36K 183M 1% /run/user/123457.创建用户
创建安装用户组
groupadd -g 10001 dinstall
创建安装用户
useradd -u 10001 -g dinstall -m -d /home/dmdba -s /bin/bash dmdba
