Cloud Applications

Crontab causes file descriptor depletion in Linux. scheduled tasks in the system cannot run after a period of time. The system command shows that the system has a large number of sendmail processes, which causes the file descriptor to run out. The

Adding a bridge Nic to kvm in linux vmware is a virtual machine used in windows. after installation, vmnet0, vmnet1, and vmnet8 are automatically added to the system, corresponding to the bridge, respectively, host-only, nat. Kvm is a virtual

To learn more about getline in awk getline, you must first understand the concepts of $0, NR, and FNR. The so-called NR can be understood as NumberofRecord, or a row number, while FNR can be understood as NumberofRecordinFile, or become a row number

Linux telnet service management 1. linux checks whether the telnet service is installed with rpm-qatelnet. if the system has not installed the Telnet service, insert the system disk for installation. 2. starting and stopping the telnet service is

CentOS System Command operation record-11, load the USB drive if there is no automount (how to set ?), You need to manually attach the USB drive. Fdisk-l # list the file systems loaded by the current system. Mount/dev/sdb1/mnt # mount the USB ..

[Nagios monitoring] NRPE: Unabletoreadoutput causes and exclusion nrpe is monitored run definition command normal, monitoring run #/usr/local/nagios/libexec/check_nrpe-H117.121.9.200-ccheck_oracle_tablespace error prompt... [nagios monitoring] NRPE:

Use Vim to compare the content of the two files. open two files in vim compare mode: vim-dfile1file2 or vimdifffile1file22. if the file file1 has been opened, open another file file2 for comparison: vertdiffsplitfile2 if not used... use Vim to

The configuration code of the bashshell variable is associated with the variable content with an equal sign "", as shown below: "mynameVBird" and the equal sign cannot be directly followed by a space character, as shown below is an error: the

Common vim operation skills and solutions to problems in linux 1. common Command % jump to pair brackets [[jump to the beginning of the code block (but require that & amp; #39 ;{& amp; #39; must take a single line) gD jumps to the definition of a

Ubuntu12.04 restart stuck problem solved I installed Ubuntu12.04 on a relatively old-fashioned desktop computer, the restart is stuck in the Ubuntu logo screen, each restart can only be forced to boot and shut down, this is especially unpleasant, so

Linux-ss command details ss-l show all locally opened ports ss-pl show each process specific opened socketss-t-a show all tcpsocketss-u-a show all UDPSocektss -ostateestablished & amp; #39; (dport :... linux-ss command details ss-l show all locally

Linux Memory management-free Command 1 free memory management as a linux system administrator, it is very important to monitor the memory usage status, through monitoring to help you understand the memory usage status, for example, whether the

In Linux, the graphic interface & mdash; XWindow installation XWindow is the XWindows graphical user interface, which is a computer software system and network protocol, provides a basic graphical user interface (GUI) and rich input device

Centos tengine's simple installation process environment description CentOSrelease5.5 (Final) kernel \ ronan \ m install the basic environment gcc install yum-yinstallgccyum-yinstallgcc-c ++ install pcreyum-yinstallpcre-devel install... centos

The passwd command does not have any permission to read the shadow file. Why can common users log on normally? we can see that the password file does not have any permission. users need to read the password file during logon, if it is correct, how

Install sysstat using iostat, sar, indicator meaning the main command provided by the linuxsysstat toolkit: iostatmpstatsarsar the last two parameters are generally intervalcount1, sar-u15 output CPU usage statistics, output once per second, output 1

UBUNTU One-sentence skills-Getting Started with Linux (for beginners) view the installation content of software xxx dpkg-Lxxx find the software apt-cachesearch regular expression find the package dpkg-Sfilenameapt-filesearchfilename which file

Linux network settings 3 & mdash; note when using the ssh tool 1. how does the ssh tool use ssh (SecureShellClient) to install it on windows, while on linux there is a service called sshd, this service occupies port 22, which is started by default.

The meaning of the process List symbol in Linux learning can be displayed by entering ps and other commands on a simulated Linux Terminal. The following describes the meanings of the symbols corresponding to some common process lists: UID: the user

Linux automatically backs up 111 and 117 servers for websites and databases. each day, 111 servers and databases are automatically backed up to 117 servers. 1: My 111 servers are the current users: sxA: view the scheduled tasks of the current user: