Linux

Mail Service SystemNslookup check if the domain name can be resolved[Email protected] ~]# firewall-cmd--set-default-zone=trust #设置默认防火墙区域为trust[Email protected] ~]# echo server0.example.com >/etc/hostname #名字改为server0. example.com[email protected] ~]

1, first through the top command to find the high CPU consumption process ID hypothesis is 118762. Perform top-p 11876 to monitor the process individually3, in the 2nd step of the monitoring interface input h, get all the thread information under

Man (manual): Help commandHelp for explaining shell internal commandsFormat: Help Shell internal Commandls command--helpMan commandInfo command. zip. gz. bz2Compressed files: Zip Compressed file name source files extract: Unzip compressed

FSCK.EXT2 (File system Check-second filesystem)Feature Description: Check the file system and try to fix the error.Syntax:fsck.ext2 [-acdffnprsstvvy][-b partition First magnetic regionAddress >][-b chunk size >][-c >][-i buffer block number

in the Linux system, the first process is inherent in the system, innate or is arranged by the kernel designer, after the kernel has booted and completed the basic initialization, there is the system first process (actually the kernel thread). In

1, at---System delay task Launch commandAt time>command---Mission instructions>ctrl+d---launch a mission650) this.width=650; "Src=" Https://s1.51cto.com/oss/201711/02/9585888818f45f6b19b957d6c25c6b97.png-wh_500x0-wm_3 -wmp_4-s_4246052655.png "style="

Basic configuration of DHCP server under Linux: First enter the NIC configuration nic IP address, setting related network information 650) this.width=650; "src=" Https://s5.51cto.com/oss/201711/05/9a2b6e3f9f9c2779ad92b97950b61f01.png "title=

admin1.5Zoning Planning and use:Hard disk partition management:Use the Fdisk partitioning tool:View a list of partitions:--fdisk-l/DEV/SDATo modify a partition table for a hard disk:--fdisk/dev/vdbCommon Interactive Commands:-M: list instruction

Linux releases the memory command:SyncEcho 1 >/proc/sys/vm/drop_cachesThe value of drop_caches can be a number between 0-3 and represents a different meaning:0: Not released (system default)1: Free Page cache2: Release dentries and Inodes3: Release

CD command descriptionThe CD command is used to switch the working directory to dirname. Where dirname notation can be either an absolute path or a relative path. If the directory name is omitted, it is transformed to the user's home directory (that

1.1 Generate keySSH2 supports both RSA and DSA keys, but SSH1 only supports RSA keys.[Email protected] ~]#Ssh-keygen-T dsagenerating Public/private DSA key pair. Enterfile inch whichTo save the key (/root/.SSH/ID_DSA): Enter Passphrase (empty forno

Crond Recurring Scheduled Tasks:[[Email protected] Desktop]# which rht-vmctl//check the location of the virtual machine program/usr/local/bin/rht-vmctl[[Email protected] Desktop]# systemctl status Crond//view Crond Status Display active indicates

Linux touch commands are not commonly used, and are generally used when using make, to modify file timestamps, or to create a new file that does not exist.1. Command format:touch [Options] ... File...2. Command parameters:-A or--time=atime

Today, a login server Web site found that login did not generate a session. Based on past experience, the session file generation failure is generally caused by a full space650) this.width=650; "Src=" Https://s1.51cto.com/oss/201710/31/3a3089af898212

The premise is that the search has already used the command, otherwise it will not be found out.Ctrl+rPurpose: Reverse-search executed commands. (Reverse-i-search)1. Press CTRL + R in any directory2. Enter a string from the history command, such as

Directory:Mkdir:mkdir-p/tmp/m/n/xMKDIR/TMP/A/B-PV Display creation ProcessExample one: mkdir/tmp/p/a/bMkdir/tmp/q/a/b--That is: mkdir/tmp/{p,q}/a/bExample two:/tmp/p/a/b/tmp/q/aMKIDR/TMP/{P/A/B,Q/A}bashl{}, expandMKDIR/TMP/{P,Q}Rmdir:remove, delete

Today, let's go into the Linux file system with Xiao Xiao.In Linux, adhering to a sentence: All documents, operations are ordered. In Linux, everything is represented in the form of a file, and all operations can be implemented with commands.First,

Linux Common commands:1.tab after the first word, for the completion of the command; After the second word, to complete the file2.LS-AL/USR list all files and attributes (including hidden files) in this directoryLL list more information3.* wildcard

Brief introductionFREERDP is an open source Remote Desktop system that supports a variety of platforms, and the use of FREERDP in Ubuntu makes it easy to log in to Windwos Remote Desktop.Installationsudo apt-get install freerdpUsexfreerdp -f

Cookie Information is added to nginx logs.1. Obtain all cookie Information This is convenient. Add $ http_cookie directly to the nginx. conf file. Log_format main '[$ time_local]-$ remote_addr: $ remote_port-$ remote_user-$ upstream_addr $