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Note: This content is excerpted from the "DevOps Troubleshooting: Best Practices for Linux server Operations" book System load The average system load is probably the first basic metric to use when solving problems that cause the

0x00 Nginx Embedded LUA scripts have the following features: 20k of concurrent connections Lua scripts can function at different levels of the Nignx 11 levels, extending Ngnix functionality Lua is extremely fast (register instructions)

The problem of automatic logout after login on the ubuntuX interface is found in Baidu ting today! When listening to songs online, the system suddenly lost its voice and thought that the flash plug-in of chrome crashed. after exiting chrome, chrome

1. lsof introduction lsof is a very practical system-level monitoring and diagnosis tool in linux. It means ListOpenFiles. it is easy to remember that it is a combination of "ls + ~ It can be used to list the file information opened by various

Official website of Pptpclient Pptpclient official http://pptpclient.sourceforge.net/howto-diagnosis.phtml#pppd_options 1. use yum to install ppp and pptp packagesYum-y install pppYum-y install pptpIf yum does not have pptp, go to the

Run the following command to install MySQL in Ubuntu: sudoapt-getinstallmysql-serverMySQL initial configuration and management start MySQLmysqlstart: mysqld is the mysql daemon to check whether mysql is started: ps-ef | Common commands in

Use Ubuntu 12.04RsyslogAs a log service, cron logging is disabled by default and can be used only after it is enabled.   Open/Etc/rsyslog. d/50-default.conf, Find the following line: # First some standard log files. log by facility. # auth,

Gitlab uses Sendmail to send emails internally. Sometimes the gitlab logs have sent emails, but some users cannot receive emails. Later, I checked the system log and found that the SMTP server rejected the request through a specified SMTP server

Quick StartThis article describes how to use scala, java, and python to compile a spark click Mode Program. First, you only need to successfully build Spark on a machine. Practice: Enter the Spark root directory and enter the command: $ sbt/sbt

1.SyslogIn UNIX class operating systems, Syslog is widely used in system logs. Syslog log messages can be recorded in a local file or sent over a network to a server receiving a syslog. The server receiving the Syslog can store the syslog messages

The file system read-only problem occurs on the USB flash drive under Ubuntu. The problem is that existing files in the USB flash drive cannot be deleted and new files cannot be copied to the USB flash drive. But I don't know why. Today, I am

This series of articles focuses on learning and researching OpenStack Swift, including environment building, principles, architecture, monitoring, and performance.(1) OpenStack + Three-node Swift cluster + HAProxy + UCARP installation and

Common Linux operating system logon files include the following:1)/var/log/secure: The file used to log on to the system to access data;For example, pop3, ssh, telnet, and ftp are all recorded here. 2)/ar/log/wtmp: records the logon information,

Solution for file read-only mode of USB flash disk in linux I often use a USB flash drive to transmit files in ubuntu. Recently I don't know why, the USB flash drive can be used normally in windows, but the file becomes read-only in linux, unable

In order to bring you some small surprises, this time we have prepared some questions randomly encountered during the interview, rather than questions about a specific field. These questions will certainly make you stand out in the interview without

  Install necessary software Apt-get install pptpd kernel-tree-2.6.10 kernel-package Apt-get install kernel-patch-mppe libc6-dev Decompress Linux kernel Cd/usr/src Tar xjf kernel-source-2.6.10.tar.bz2 Configure the kernel I copied an existing config

After reading the sixth chapter of this book, I Learned: Each driver in the Linux system is mapped to a file (device file/driver file), which is stored in the/dev directory. The function of the rollback function is to enable the Linux

The call technology of embedded Linux--10th Chapter reading notes and ExperienceThe PRINTK function is understood through the study in this chapter. This function is similar to the printf function for printing kernel debugging information. Just the

One, cat display file connection file contents of the tool Cat is a text file (view) and (connection) tool, often used in conjunction with more, and the more different is that cat can merge files. To view the contents of a file, it is simpler to

Canonical company released a new 16.04 system in the last April 2016, and this system is long term support-lts. It supports the Debian installation package as always, but it also supports the latest snap installation package. The snap installation