CentOS
常用工具 配置修改（主机名，PS1，selinux，ulimit） 目录规划 终端/文件描述符/重定向 标准目录层次 用户与权限
grep sed awk sleep wait tar ls mkdir echo 待续
ssh rsync nfs iptables ntp/ntpdate/chrony 待续
yum install dos2unix lrzsz wget bash-completion vim telnet net-tools tree lsof psmisc -y
[修改主机名]：hostnamectl set-hostname stock.data.news.100
[查看主机名]：hostname
[关闭selinux]：setenforce 0
[修改selinux]：sed -r -i'*.bak' 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/selinux/config
[命令行提示符修改]：/etc/profile
# PS1 color
color_background_black='40'
color_background_red='41'
color_background_green='42'
color_background_yellow='43'
color_background_blue='44'
color_background_purple='45'
color_background_dark_green='46'
color_background_white='47'
color_red='\[\e[31;'${color_background_black}'m\]'
color_black='\[\e[30;'${color_background_black}'m\]'
color_green='\[\e[32;'${color_background_black}'m\]'
color_yellow='\[\e[33;'${color_background_black}'m\]'
color_blue='\[\e[34;'${color_background_black}'m\]'
color_purple='\[\e[35;'${color_background_black}'m\]'
color_dark_green='\[\e[36;'${color_background_black}'m\]'
color_white='\[\e[37;'${color_background_black}'m\]'
my_days="$(cal $(date +%m) $(date +%Y))"
#my_days=$(echo $my_days | sed -r 's/.*([0-9]{2})/\1/')
#my_days=$(echo ${my_days##* })
my_days="$(echo "$my_days" | tail -n 1)"
my_days="${my_days##* }"
my_date="$(date +%F/${my_days}@%u)"
#my_login="$(who am i | awk '{print $2,$5}')"
my_login="$(who am i | awk '{print $2}')"
ps_begin='\n'"${color_red}"'['
ps_user="${color_green}"'\u'
ps_host="${color_yellow}"'\H'
ps_path="${color_dark_green}"'\w'
ps_date="${color_purple}${my_date} "'\t'
ps_login="${color_blue}${my_login}"
ps_end='\[\e[31;40m\]]'
ps_prompt='\n\[\e[37;5m\]\$ \[\e[0m\]'
export PS1="${ps_begin} ${ps_user}@${ps_host} ${ps_login} ${ps_date} ${ps_path} ${ps_end} ${ps_prompt}
[PS1 效果如下]：
[ root@stock.data.news.100 pts/0 2021-01-02/31@6 10:28:47 /Server/datas/downloads/scripts ]
#
配置 limit
[ root@stock.data.news.100 pts/0 2021-01-02/31@6 15:56:13 /Server/logs ]
# cat /etc/security/limits.d/20-nproc.conf
* soft nproc 65535
root soft nproc unlimited
* hard nproc 65535
root hard nproc unlimited
* hard nofile 65535
* hard nofile 65535
[ root@stock.data.news.100 pts/0 2021-01-02/31@6 15:56:18 /Server/logs ]
# cat /etc/security/limits.conf
* soft core unlimit
* hard core unlimit
* soft fsize unlimited
* hard fsize unlimited
* soft data unlimited
* hard data unlimited
* soft stack unlimited
* hard stack unlimited
* hard nproc 65535
* soft nproc 65535
* hard nofile 65535
* hard nofile 65535
[ root@stock.data.news.100 pts/0 2021-01-02/31@6 16:06:06 /Server/logs ]
# grep -vE '^#|^$' /etc/systemd/system.conf
[Manager]
DefaultLimitCORE=infinity
DefaultLimitNOFILE=65535
DefaultLimitNPROC=65535
[ root@stock.data.news.100 pts/0 2021-01-02/31@6 16:07:36 /Server/logs ]
# grep -vE '^#|^$' /etc/systemd/user.conf
[Manager]
DefaultLimitCORE=infinity
DefaultLimitNOFILE=65535
DefaultLimitNPROC=65535
重启系统，检查 ulimit
[ root@stock.data.news.100 pts/0 2021-01-02/31@6 16:09:31 ~ ]
# ulimit -a
core file size (blocks, -c) unlimited
data seg size (kbytes, -d) unlimited
scheduling priority (-e) 0
file size (blocks, -f) unlimited
pending signals (-i) 15633
max locked memory (kbytes, -l) 64
max memory size (kbytes, -m) unlimited
open files (-n) 65535
pipe size (512 bytes, -p) 8
POSIX message queues (bytes, -q) 819200
real-time priority (-r) 0
stack size (kbytes, -s) unlimited
cpu time (seconds, -t) unlimited
max user processes (-u) unlimited
virtual memory (kbytes, -v) unlimited
file locks (-x) unlimited
[ root@stock.data.news.100 pts/0 2021-01-02/31@6 16:09:37 ~ ]
# ls /proc/
1 1046 12 1647 19 24 284 310 36 46 476 5 6 730 8 cmdline execdomains kallsyms locks net softirqs tty
10 1047 1253 1648 1901 25 285 311 37 47 477 50 66 733 9 consoles fb kcore mdstat pagetypeinfo stat uptime
101 1051 127 1650 1944 26 286 312 38 470 478 51 7 734 969 cpuinfo filesystems keys meminfo partitions swaps version
1039 1065 13 1770 2 27 29 313 4 471 479 52 721 735 acpi crypto fs key-users misc sched_debug sys vmallocinfo
1040 1066 14 1773 20 28 3 314 445 472 48 53 722 736 asound devices interrupts kmsg modules schedstat sysrq-trigger vmstat
1041 1075 1450 1774 21 281 30 315 446 473 480 560 723 744 buddyinfo diskstats iomem kpagecount mounts scsi sysvipc zoneinfo
1042 1089 15 1775 22 282 306 320 456 474 481 580 724 754 bus dma ioports kpageflags mpt self timer_list
1044 11 16 18 23 283 307 35 457 475 49 585 728 755 cgroups driver irq loadavg mtrr slabinfo timer_stats
[ root@stock.data.news.100 pts/0 2021-01-02/31@6 16:09:59 ~ ]
# more /proc/1046/limits
Limit Soft Limit Hard Limit Units
Max cpu time unlimited unlimited seconds
Max file size unlimited unlimited bytes
Max data size unlimited unlimited bytes
Max stack size 8388608 unlimited bytes
Max core file size unlimited unlimited bytes
Max resident set unlimited unlimited bytes
Max processes 65535 65535 processes
Max open files 65535 65535 files
Max locked memory 65536 65536 bytes
Max address space unlimited unlimited bytes
Max file locks unlimited unlimited locks
Max pending signals 15633 15633 signals
Max msgqueue size 819200 819200 bytes
Max nice priority 0 0
Max realtime priority 0 0
Max realtime timeout unlimited unlimited us
目录/文件规划： 创建根目录：首字母大写的驼峰格式 创建非根目录：小字母与减号组成 创建文件：小字母与下划线组成 /Server
/Server/readme.txt # 对子目录的描述
/Server/softwares.txt # 描述该服务器安装了那些软件
/Server/system_config.txt # 描述该服务器修改了那些配置文件 /Server/program-files # 程序 /Server/program-files/mysql-8.0.22 # MySQL程序 /Server/datas # 存放数据 /Server/datas/downloads/scrips # 存放脚本 /Server/datas/downloads/yum # 存放yum下载的rpm包
/Server/datas/mysql-8.0.22-3306 # MySQL 数据及配置文件存放
/Server/runnings # 存放pid，sock文件等 /Server/logs # 存放日志
# chmod 777 /Server/{logs,runnings}
# chmod o+t /Server/{logs,runnings}
posted on 2021-01-01 17:29 3L·BoNuo·Lotus 阅读(132) 评论(0) 编辑 收藏 举报
