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When the environment variable is written to the configuration file, it still takes effect after restarting the machine 1. Location of environmental variables Following are the default configuration files for five types of storage environment variables The environment variables stored in / etc/profile / etc/profile.d/*.sh and / etc/bashrc ...

Apache Spark is a fast and versatile computing engine designed for large-scale data processing. It can perform a wide range of operations, including SQL queries, text processing, machine learning, etc. Before the advent of Spark, we generally needed to learn a variety of engines to handle these requirements separately.The main purpose of this a ...

Let's recall how you released your code last time: 1. First, back up the online code with ftp 2. Upload modified files 3. Test whether the function is normal. 4. The website is 500. Replace it with a backup as soon as possible. 5. The replacement is wrong/the replacement is missing. 6. A successful server release 7. Log on to each station to pe ...

1. git config (self not verified on organized web) The git config configuration file used to configure git has three locations corresponding to different overrides. (1), /etc/gitconfig file: Include values that apply to all users and libraries of the system.If the parameter option'--system'is passed to git config, it will explicitly ...

1. Ansible architecture Ansible's help documentation:http://www.ansible.com.cn/index.html 2. Introduction to YAML Language Basic Rules All members of the list (list, [,,,...]) begin with the same indentation level and begin with "-". Requirements - A space must be followed. - apple - banana - orange - pear Corresponding python outp ...

1. zabbix remote command:1.1 Function:    Restart service;    Restart the server through IPMI interface.    Functions that any custom script can accomplish: cleaning disk space, virtual machine instance migration, etc.1.2 Related attributes:    Tatget list: The target ho ...

Learn about last command and its data source under linux last Data sources: / var/log/wtmp (default record of login times and duration per user, etc.) and / var/log/btmp (details, including login failure requests)Data source format: binary (read through dump-utmp command) Last [-adRx][-f][-n] [Account Name...] [Terminal Number...] Fig ...

More commands are available on the official website: https://docs.docker.com/engine/reference/commandline/docker/ View the current image list docker image ls [OPTIONS] [REPOSITORY[:TAG]] List images Aliases: ls, images, list Options: -a, --all Show all images (default hides intermediate images) --digests ...

Catalog Learning Notes: CentOS 7 Learning Seventeenth: Linux Scheduled Tasks and Log Management 17.1 Planned Task-at-cron-Planned Task Usage Method 17.1.1 Utilization of at Planned Tasks 17.1.2 View and delete planned tasks to be performed by at 17.1.3 Use of Crontab Timing Tasks Introduction of 17.1 ...

Special permission set_uidBy default, under the newly installed Linux system, only one command has set_uid special privileges.Commands (files) with s privileges: To ensure that non-owner users have temporary ownership when using this command; set_uid special privileges for a file, provided that the file is an executable binary file (usually wit ...