linux foundation certified system administrator

powerful as the KDE System Guard, the basic information it provides is very useful for getting started users.* Displays a variety of basic information about computer hardware and software.* Linux kernel version* Gnome Version* Hardware* Installed Memory* Processor and its speed* System Status* The currently available hard disk space* Process* Memory and swap spa

– The client will mount this shared directory to a local directory to access this shareResources are as convenient as accessing a local directory– Similar to EXT4, XFS and other types, except that resources are online? View NFS Resources[Email protected] ~]# showmount-e 172.25.254.254? Mount to mount NFS shared content on the server to a local directory[Email protected] ~]# mkdir/home/guests# Mount 172.25.254.254:/home/guests/??/home/guests[Email protected] ~]# ls/home/guests[Email protected] ~]

: Specify the server-side LDAP location? ??? 1. Installing the Client Software? ? ? Package? ? ? ? ? SSSD: Communication software with the server? ? ? ? ? AUTHCONFIG-GTK: Graphics Configuration SSSD Tool[Email protected] ~]# rpm-q sssd????? #验证软件包安装成功[Email protected] ~]# rpm-q AUTHCONFIG-GTK? 2. Run the Graphics Configuration SSSD tool: AUTHCONFIG-GTK[Email protected] ~]# AUTHCONFIG-GTK? User account Database: LDAP? LDAP Search Base dn:dc=example,dc=com? LDAP server: classroom.example.comCheck:

] ~]# readonly myvar= "How is it?" [Email protected] ~]# readonly declare-r myvar= "How is it?"(10). I/O redirection and pipingInput data flow: Standard output redirection:[Email protected] tmp]# echo "How IS Is?" > Demo #覆盖 [[email protected] tmp]# echo "How is old is you?" >> dem o #追加Standard Error Output redirection:[Email protected] tmp]# echoooo "How is it?"2> demo #覆盖 [[email protected] tmp]# echoooo "How is old is you?" 2>> Demo #追加Merge standard output with standard error output:[Email

? Bootproto=none???? #手动配置? Onboot=yes?????? #每次开机自动启用? Ipaddr0=172.25.0.11? #IP地址? Prefix0=24?????? #子网掩码? gateway0=172.25.0.254? #网u关4. Configure a permanent DNS server,/etc/resolv.conf?? in the Linux system, the configuration file content, "#" begins with the comment text??[[email protected] ~]# vim/etc/res (tab)? nameserver? 172.25.254.254##################################################True on-Machine

Need to monitor Linux server system performance? Try these tools built in or attached to the system below. Most Linux distributions are equipped with a large number of monitoring tools. These tools provide metrics that can be used to obtain relevant information and system ac

, --create-home creates a user's home directory -m,--no-create-home does not create a user's home directory -n,-- No-user-group does not create a group with the same name -o,--non-unique allow duplicate UID create user -p,--password New account password after password encryption -r,--system Create a System account -r,--rootchroot_dir chroot to the directory -s,--shell Shell New Account Login shell-u,--uid

source to download the installation package from the domestic update sourceFive, close SELinux and iptables (if there is an extranet IP open)Six, adjust the number of file descriptors, process and file opening will consume the file descriptorSeven, regular automatic cleanup mail directory junk file, prevent inodes node fullViii. streamline and retain the necessary boot-up servicesNine, the Linux kernel parameter optimizes/etc/sysctl.conf, then execut

contents of one or more files on the screen, which continuously displays the contents of the entire file in a read-only manner Head Browse the contents of the file The first 10 lines of a file are displayed by default - N: Change the number of rows displayed, for example head–n 5/etc/passwd View details of the first 5 rows in the/etc/passwd file Tail Browsing the contents of a file Displays the contents of the last 10 lines of the fi

, whether commands, hardware, software devices, processes, communication interfaces, and so on, are considered to have their own characteristics or types of files . ② Each software has a specific purpose, with a number of functions of a single program to complete complex tasks. ③ tries to avoid interacting with users, and it is easy to automate tasks in a programmatic way. ④ Use a text file to save configuration information. 2, completely freeUsers can be obtained through the network or othe

, opening file A will cause an error: "No such file or directory". This is the biggest difference between soft links and hard links: file a points to file B's file name, not file B's inode number, and file B's Inode "link count" does not change.The ln-s command can create a soft link. Ln-s source file or directory destination file or directory Viii. the special role of the InodeBecause the inode number is separated from the file name, this mechanism causes some unix/

The nonprofit Linux Foundation is announcing today the Openswitch project as one of the Linux Foundation's official projects to drive the development of Linux and open source software for businesses and professionals."Openswitch is another important component of the Open Network protocol stack for the

will be lost. If the system has important data to choose No, keep the data, select Yes here.650) this.width=650; "Src=" https://s2.51cto.com/wyfs02/M02/8E/E2/wKioL1jOkUPRZbEEAAF9n9wNm7U752.png-wh_500x0-wm_ 3-wmp_4-s_2830786405.png "title=" Qq20170319220951.png "alt=" Wkiol1jokuprzbeeaaf9n9wnm7u752.png-wh_50 "/>650) this.width=650; "Src=" https://s1.51cto.com/wyfs02/M00/8E/E4/wKiom1jOkWeylhu9AAGtCFWV71k289.png-wh_500x0-wm_ 3-wmp_4-s_2968084471.png "ti

, whether commands, hardware, software devices, processes, communication interfaces, and so on, are considered to have their own characteristics or types of files . ② Each software has a specific purpose, with a number of functions of a single program to complete complex tasks. ③ tries to avoid interacting with users, and it is easy to automate tasks in a programmatic way. ④ Use a text file to save configuration information. 2, completely freeUsers can be obtained through the network or othe

-i.bak ' S#ZH_CN. Utf-8#zh_cn. Utf-8#g '/etc/sysconfig/i18n[Email protected] ~]# #备份i180文件再修改[[Email protected] ~] #source/etc/sysconfig/i18n############################################################Vim operationC caps The contents of the cursor to the end of the line to delete and enter the edit mode[email protected] ~] #chkconfig #管理开机启动Reboot restarting the serverShutdown Shutdown/Restart-R Restart-H shutdown-C Cancel current shutdown and restartESC + .Summarize:1. Display

1. Linux BASIC Environment 1.1 Big data Hadoop pre-outline Tutorial1) Linux system, Basic command2) Java language, javase related knowledge3) MySQL basic DML and DDL1.2 Common Linux systems, installing VMware and Virtual Machine 1.3 virtual Machine network configuration (IP address, hostname, firewall) 1.4 Remote Conne

Linux System Foundation tuning1. turn off SELinux and empty iptablesSed-i ' s/selinux=enforcing/selinux=disabled/g '/etc/selinux/configgrep selinux=disabled/etc/selinux/ Configsetenforce 0iptables-fiptables-xiptables-ziptables-l/etc/init.d/iptables Save2. Add a regular user and perform sudo authorization managementUseradd liwenecho ' 123456 ' |passwd--stdin liw

/' /etc/ssh/sshd_config #alter ssh defaultport16182sed-i ' S/^permitrootloginyes/permitrootloginno /' /etc/ssh/sshd_configsed-i ' s/^# permitemptypasswordsno/permitemptypasswordsno/' /etc/ssh/sshd_config sed-i ' s/^ #MaxAuthTries 6/maxauthtries3/' /etc/ssh/sshd_ configsed-i ' $aAllowUsers zkyw ' /etc/ssh/ sshd_config #allow commonuserzkywsshlogin /etc/init.d/sshdreload}## #clock Synchronouswithinternet time## #function ntpclock () {/usr/sbin/ntpdate 202.120.2.101echo "3022***/ usr/sbin/ntpdate20

1, virtual network card to implement a network card multiple addresses2, multi-Nic Bond,mode13. Routing ExperimentFirst, homework:1, a company to apply to a class C IP address, but to connect 6 subsidiaries, the largest subsidiary has 26 computers, each subsidiary in a network segment, the subnet mask should be set to?Class C Public IP address192.0.0.0~192.167.255.255192.169.0.0~223.255.255.255As defined by Class C networksThe first three paragraphs are the network number, the last segment is th

protected]~]# Echo11[[Email protected]~]# Echo22[[Email protected]~]# Echo33[[Email protected]~]# Echo44[[Email protected]~]# Echo55[[Email protected]~]# history-d3#删除指定行记录 [[email protected]~]# History1 History2Echo1 3Echo3 4Echo4 5Echo5 6History-d3 7History[[email protected]~]# !6#执行某行历史命令History-D3[[Email protected]~]# Export histsize=5#控制历史记录记录数量 (temporarily in effect) #永久生效放在/etc/profile file, and then source the following/etc/Profile[[email protected]~]# History5 History6E