投稿時間:2023-03-05 22:10:41 RSSフィード2023-03-05 22:00 分まとめ(15件)

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python	Pythonタグが付けられた新着投稿 - Qiita	OpenAIのAPIを使用してyoutubeのデータを取得しその動画で伝えたいことをbotに聞いてみた	https://qiita.com/yoshinosatoshi/items/92a61049a84b37b183e3	openai	2023-03-05 21:37:07
python	Pythonタグが付けられた新着投稿 - Qiita	(Cognito/Lambda)JWTをBase64でデコードしたときのエラー``` Error: Incorrect padding ```の解決策	https://qiita.com/taiyyytai/items/60bfa2b13397a2b4c3a4	basejson	2023-03-05 21:07:21
js	JavaScriptタグが付けられた新着投稿 - Qiita	LangChain JSでChatGPTAPIを試す	https://qiita.com/mentai_mayo/items/6e53843d557692c9a019	chatgpt	2023-03-05 21:57:04
Ruby	Rubyタグが付けられた新着投稿 - Qiita	【Rspec】カラム更新処理のテストをワンライナーで書くときの小ネタ	https://qiita.com/emrum_/items/9340951568ea6765bbee	itexpectsubjecttoc	2023-03-05 21:17:52
Ruby	Rubyタグが付けられた新着投稿 - Qiita	ポートフォリオを作ろうとしているそこの貴方へ	https://qiita.com/ooyama-tetu/items/6434317898ec3fddd0a6	意気込み	2023-03-05 21:02:22
AWS	AWSタグが付けられた新着投稿 - Qiita	[AWS]ドメインの登録	https://qiita.com/tumu1632/items/668ea4121efe4f9d5a57	表示	2023-03-05 21:39:41
AWS	AWSタグが付けられた新着投稿 - Qiita	AWS 初めてのCloud Formation	https://qiita.com/asuhi/items/e6e471b4d16824c17c9d	cloud	2023-03-05 21:19:57
AWS	AWSタグが付けられた新着投稿 - Qiita	(Cognito/Lambda)JWTをBase64でデコードしたときのエラー``` Error: Incorrect padding ```の解決策	https://qiita.com/taiyyytai/items/60bfa2b13397a2b4c3a4	basejson	2023-03-05 21:07:21
Ruby	Railsタグが付けられた新着投稿 - Qiita	silckスライドショー	https://qiita.com/ayamo/items/e82b694afffcd2f2a20b	javascript	2023-03-05 21:35:27
Ruby	Railsタグが付けられた新着投稿 - Qiita	【Rspec】カラム更新処理のテストをワンライナーで書くときの小ネタ	https://qiita.com/emrum_/items/9340951568ea6765bbee	itexpectsubjecttoc	2023-03-05 21:17:52
Ruby	Railsタグが付けられた新着投稿 - Qiita	ポートフォリオを作ろうとしているそこの貴方へ	https://qiita.com/ooyama-tetu/items/6434317898ec3fddd0a6	意気込み	2023-03-05 21:02:22
海外TECH	DEV Community	Essential Linux Commands Every DevOps Engineer Should Know – Part 2	https://dev.to/aradwan20/essential-linux-commands-every-devops-engineer-should-know-part-2-4n6a	Essential Linux Commands Every DevOps Engineer Should Know Part Previously we discussed several categories of Linux commands including system information file and directory management system maintenance user and groups management package management and network management In this article we will continue with a list of additional important Linux commands that are commonly used by DevOps Linux engineers and other technical professionals Before we proceed with the list of commands let s address some common questions about Linux and DevOps Understanding these questions and the answers will provide a better understanding of the topic in general Do DevOps Engineers use Linux Yes DevOps engineers use Linux extensively in their work Linux is a popular operating system for hosting applications managing infrastructure and automating processes which are all key responsibilities of a DevOps engineer Linux is also widely used for cloud computing which is becoming increasingly important in the world of DevOps DevOps engineers use Linux for a variety of tasks including managing servers and other infrastructure components configuring network settings deploying applications monitoring performance and availability and automating processes They also use Linux based tools for source code management continuous integration and delivery and collaboration In addition to Linux DevOps engineers may also work with other operating systems such as Windows and macOS depending on the needs of their organization However given the popularity of Linux in the DevOps world and its extensive support for various tools and technologies it s critical for DevOps engineers to have a good understanding of Linux and its commands What is Shell Scripting Shell scripting is a way to write computer programs using commands that you would normally type in a command line or terminal Think of it like giving your computer a set of instructions to follow just like you would give a friend a list of things to do For example imagine you want to create a script to copy all of the photos in a folder to a new folder Instead of manually copying and pasting each file you can write a shell script to do it for you Example of what the shell script might look like bin bashmkdir new foldercp jpg new folderThis script first creates a new folder called new folder using the mkdir command Then it uses the cp command to copy all files with the jpg extension from the current folder to the new folder Shell scripting can be really helpful when you have a repetitive task to do or need to automate a process What are Environment Variables Environment variables are like secret codes that your computer uses to keep track of important information about your system and the programs you re running They re like little pieces of information that your computer can remember and use later so you don t have to keep typing them in over and over again For example imagine you want to run a program that requires your username and password Instead of typing them in every time you run the program you can use environment variables to store them Example of how environment variables might be used export USERNAME johndoeexport PASSWORD MySecurePasswordIn this example we re setting two environment variables USERNAME and PASSWORD We re assigning the value johndoe to the USERNAME variable and MySecurePassword to the PASSWORD variable Now when we run the program that needs our username and password we can use these environment variables instead of typing them in each time my program u USERNAME p PASSWORDThe symbol tells the computer to look for the value of the environment variable instead of treating it like a normal word Environment variables can be really helpful for keeping track of important information like your username and password or the location of important files What is container development Container development is a process of building testing and deploying applications using containerization technology Containers are lightweight portable and self contained environments that can run anywhere from developer laptops to production servers In container development developers package their applications and dependencies into containers which can then be deployed to various environments such as development testing and production Containers allow developers to build applications that are isolated from the underlying infrastructure making it easier to manage dependencies ensure consistency across different environments and deploy applications quickly Container development often involves the use of container orchestration platforms such as Kubernetes and Docker Swarm which help manage the deployment and scaling of containerized applications These platforms can automatically provision and manage containers across a cluster of servers ensuring high availability and scalability Container development has become increasingly popular in recent years due to its many benefits including faster development and deployment cycles improved scalability and portability and better resource utilization It also helps enable a DevOps approach as developers and operations teams can work together more closely using the same tools and processes to ensure the smooth and efficient operation of containerized applications Now let us dive in with more Linux commands System LogsSystem logs are a crucial tool for diagnosing and troubleshooting issues on a system Here are three commonly used commands for managing and analyzing system logs journalctl This command is used to query and display logs from the systemd journal which is a centralized logging system used in many modern Linux distributions journalctl can be used to view logs from all available log sources or from a specific log source such as the kernel a service or a user session Take a look at this example journalctl u sshd serviceThis command will display the logs for the sshd service system service dmesg This command is used to display kernel ring buffer messages which contain information about the status of the kernel and the system hardware dmesg can be used to view the most recent kernel messages or all kernel messages since the last boot Example dmesg tailThis command will display the last few lines of the kernel ring buffer tail This command is used to show the last few lines of a file It can be used to monitor log files in real time by using the f option to follow the file as new entries are added Example tail f var log syslogThis command will display the latest entries in the syslog file as they are added File Compression and Archivingfile compression and archiving are essential tools for managing large amounts of data Here are a few commonly used commands for file compression and archiving tar This command is used to create and extract tar archives which are used to bundle files and directories together tar can be used to compress and decompress files using the gzip or bzip algorithms Here are some examples tar cvzf archive tar gz path to directoryThis command will create a new tar archive called archive tar gz of the path to directory directory using the gzip compression algorithm tar xvzf archive tar gzThis command will extract the contents of the archive tar gz archive to the current directory gzip and bzip These commands are used to compress and decompress files using the gzip and bzip algorithms respectively Here are some examples gzip file txtThis command will compress the file txt file using the gzip algorithm creating a new file called file txt gz gzip d file txt gzThis command will decompress the file txt gz file creating a new file called file txt bzip file txtThis command will compress the file txt file using the bzip algorithm creating a new file called file txt bz bzip d file txt bzThis command will decompress the file txt bz file creating a new file called file txt zip and unzip These commands are used to create and extract zip archives which are a popular file format for compressing and archiving files Here are some examples zip archive zip file txt file txtThis command will create a new zip archive called archive zip containing the file txt and file txt files unzip archive zipThis command will extract the contents of the archive zip file to the current directory z This command is used to create and extract z archives which are another popular file format for compressing and archiving files Here are some examples z a archive z path to directoryThis command will create a new z archive called archive z of the path to directory directory z x archive zThis command will extract the contents of the archive z archive to the current directory System SecuritySecure remote access and network security are essential for protecting sensitive data and systems Here are a few commonly used commands for secure remote access and network security ssh This command is used to securely connect to a remote system over the network ssh encrypts all traffic between the local and remote systems providing a secure and private connection Example ssh user remote hostThis command will securely connect to the remote host system as the user user scp This command is used to securely copy files to or from a remote system over the network scp uses the same encryption as ssh to protect the data in transit Example scp file txt user remote host path to destination This command will securely copy the file txt file to the remote host system at the path to destination directory openssl This command is a versatile cryptographic library that can be used for a wide range of security tasks such as SSL TLS connections certificate management and more Here are some examples openssl s client connect example com This command will establish an SSL TLS connection to the example com web server on port and display the server s SSL TLS certificate openssl x in cert pem textThis command will display the details of the SSL TLS certificate stored in the cert pem file iptables This command line tool is used to configure the Linux kernel s firewall providing network security by controlling the incoming and outgoing network traffic Example sudo iptables A INPUT p tcp dport j ACCEPTThis command will allow incoming TCP traffic on port the default SSH port through the firewall Process ManagementProcess management is essential for controlling system resources and optimizing system performance Here are a few commonly used commands for process management pgrep This command is used to search for processes by name or other attributes pgrep returns the process ID PID of matching processes which can be used with other commands such as kill or renice Example pgrep u user name f process nameThis command will search for processes with the name process name that are being run by the user name user pkill This command is used to send a signal to one or more processes to terminate them pkill can be used with the same search criteria as pgrep to select which processes to terminate Example pkill u user name f process nameThis command will terminate all processes with the name process name that are being run by the user name user nice This command is used to set the priority of a process The priority value ranges from highest priority to lowest priority with being the default priority Example nice n commandThis command will run the command with a lower priority higher nice value than the default priority renice This command is used to change the priority of a running process The command takes the PID of the process as an argument as well as the new priority value Example renice n This command will change the priority of the process with PID to a lower priority higher nice value than the current priority screen This command is a terminal multiplexer that allows you to run multiple terminal sessions within a single screen session This is particularly useful when working with remote systems as it allows you to detach and re attach to the terminal sessions as needed Example screenThis command will start a new screen session To detach from the session press Ctrl A then d To re attach to the session use the screen r command System Monitoringsystem monitoring is essential for managing system resources and optimizing system performance Here are a few commonly used commands for system monitoring htop This command is an interactive process viewer that shows CPU and memory usage and allows you to manage processes htop provides a real time view of the system s process usage and system resources making it a powerful tool for managing system performance Here s an example htopThis command will start the htop process viewer nmon This command is a system performance monitor that shows CPU memory disk and network usage in real time nmon provides a detailed view of the system s performance allowing you to identify performance bottlenecks and optimize system performance Here s an example nmonThis command will start the nmon performance monitor iostat This command is used to display CPU disk and network I O statistics iostat provides a detailed view of the system s I O usage allowing you to identify I O bottlenecks and optimize system performance Here s an example iostat d x This command will display the disk I O statistics every second vmstat This command is used to display virtual memory statistics vmstat provides a detailed view of the system s memory usage allowing you to identify memory bottlenecks and optimize system performance Here s an example vmstat This command will display the memory statistics every second free This command is used to display memory usage statistics free provides a simple view of the system s memory usage allowing you to identify memory usage trends and optimize system performance Here s an example free hThis command will display the memory usage statistics in a human readable format perf This command is a profiling tool for Linux that can be used to analyze system performance perf can be used to identify performance bottlenecks analyze system call and interrupt activity and optimize program behavior Here s an example perf record myprogramThis command will record performance data for myprogram and generate a report using perf report Text Processingtext processing is an essential task that involves manipulating text data in various ways Here are a few commonly used commands for text processing grep This command is used to search for a pattern in a file or input stream grep can be used with regular expressions to search for complex patterns in text data Here s an example grep pattern file txtThis command will search for lines in file txt that contain the word pattern sed This command is a stream editor that can perform various text transformations on an input stream sed can be used to find and replace text insert or delete lines and perform other text transformations Here s an example sed s pattern replacement g file txtThis command will replace all occurrences of pattern with replacement in file txt awk This command is a powerful programming language for text processing awk can be used to manipulate text data in many ways such as selecting columns performing calculations and formatting output Here s an example awk print file txtThis command will print the first and third columns of file txt cut This command is used to select portions of each line of a file cut can be used to extract specific columns or ranges of characters from text data Here s an example cut d f file csvThis command will extract the first and third columns of file csv assuming the columns are delimited by commas tr This command is used to translate or delete characters in a stream of text tr can be used to convert uppercase characters to lowercase remove whitespace or perform other character transformations Here s an example tr upper lower lt file txtThis command will convert all uppercase characters in file txt to lowercase sort This command is used to sort the lines of a file or input stream sort can be used to sort text data in various ways such as numerically alphabetically or based on field positions Here s an example sort file txtThis command will sort the lines of file txt in alphabetical order uniq This command is used to remove duplicate lines from a file or input stream uniq can be used to remove consecutive or non consecutive duplicate lines Here s an example uniq file txtThis command will remove all consecutive duplicate lines from file txt wc This command is used to count the number of lines words and characters in a file or input stream wc can be used to generate word counts and perform other text statistics Here s an example wc file txtThis command will display the line word and character count of file txt Debugging ToolsDebugging is an important part of software development and Linux provides a variety of powerful debugging tools for developers Here are a few commonly used commands for debugging in Linux strace This command is used to trace system calls and signals of a process strace can be used to identify system call errors diagnose application problems and analyze system performance Here s an example strace myprogram strace myprogramThis command will trace the system calls and signals of myprogram ltrace This command is used to trace library calls of a process ltrace can be used to identify library call errors diagnose application problems and analyze system performance Here s an example ltrace myprogram ltrace myprogramThis command will trace the library calls of myprogram gdb This command is the GNU Debugger used to debug and analyze C C programs gdb can be used to identify errors analyze program flow and modify program behavior Here s an example gdb myprogram gdb myprogramThis command will start the GNU Debugger for myprogram valgrind This command is a tool for memory debugging memory leak detection and profiling valgrind can be used to identify memory errors diagnose application problems and analyze system performance Here s an example valgrind myprogram valgrind myprogramThis command will run myprogram under valgrind to detect memory errors Miscellaneousfind This command is used to search for files in a directory hierarchy Here s an example find home user Documents name txt This command will search for all files with the extension txt in the Documents directory of the user user cron This command is a tool for scheduling periodic tasks It can be used to schedule commands to run at specific intervals such as daily weekly or monthly Here s an example crontab eThis command will open the user s crontab file in an editor where they can add entries to schedule commands to run at specific times watch This command is used to execute a command periodically and display the output It can be used to monitor the output of a command in real time Here s an example watch n ls l This command will run the ls l command every second and display the output in the terminal history This command is used to display a list of recently executed commands It can be used to recall previous commands and to repeat them Here s an example historyThis command will display a list of the user s recently executed commands sudo This command is used to execute a command with superuser privileges It can be used to perform tasks that require root level access such as installing packages or modifying system files Here s an example sudo apt get updateThis command will update the package list using the apt get command with root level access diff This command is used to compare two files or directories and display the differences between them It can be used to identify changes additions and deletions between two versions of a file or directory Here s an example diff file txt file txtThis command will compare the contents of file txt and file txt and display the differences between them rsync This command is used to synchronize files and directories between two locations such as a local machine and a remote server It can be used to transfer files securely and efficiently and to perform incremental backups Here s an example rsync avz path to local dir user remote path to remote dirThis command will synchronize the contents of the local directory path to local dir with the remote directory path to remote dir on the server remote using the rsync protocol curl This command is used to transfer data from or to a server using various protocols such as HTTP FTP or SMTP curl can be used to test API endpoints download files and perform other network related tasks Here s an example curl This command will fetch the contents of and display them in the terminal wget This command is used to download files from the Internet wget can be used to download files in the background resume interrupted downloads and mirror entire websites Here s an example wget This command will download file zip from ssh keygen This command is used to generate SSH key pairs for secure authentication ssh keygen can be used to create new keys import or export keys and manage key authentication settings Here s an example ssh keygen t rsaThis command will generate a new RSA key pair for SSH authentication ConclusionDevOps engineers are responsible for the development deployment and management of software applications and systems They need to be proficient in a wide range of tools and technologies including various Linux commands to be successful in their role Here are some reasons why it s critical for DevOps engineers to be aware of all these commands Streamline workflows By mastering these Linux commands DevOps engineers can streamline their workflows automate repetitive tasks and become more efficient in their daily work Improve productivity Knowing these commands can help DevOps engineers troubleshoot issues faster perform tasks with greater accuracy and respond to incidents more quickly ultimately improving productivity Manage infrastructure DevOps engineers need to be able to manage servers containers and other infrastructure components and many of these commands are essential for that Troubleshoot issues When issues arise in production DevOps engineers need to be able to quickly diagnose and fix the problem Knowing these Linux commands can help them identify the root cause of issues and resolve them quickly Hers is a good assignment for you to practice more with the commands above and what s in part as well Creating a cheatsheet of these Linux commands can help you as a DevOps engineer to quickly access and reference these tools when needed It can also serve as a reference for new team members or as a reminder for infrequently used commands By being proficient in these commands DevOps engineers can be more effective in their roles ultimately contributing to the success of the organization	2023-03-05 12:13:39
ニュース	@日本経済新聞 電子版	国内コロナ感染、新たに8665人　累計3327万7093人 https://t.co/9wC874HRZZ	https://twitter.com/nikkei/statuses/1632359937476280320	累計	2023-03-05 12:38:31
ニュース	@日本経済新聞 電子版	バフェット氏「恐怖相場は友」　保険など優良株割安に https://t.co/7hyVeL8tK7	https://twitter.com/nikkei/statuses/1632357824335364097	相場	2023-03-05 12:30:07
ニュース	BBC News - Home	Eilish McColgan sets new British 10,000m record, beating Paula Radcliffe's 2002 time	https://www.bbc.co.uk/sport/athletics/64853509?at_medium=RSS&at_campaign=KARANGA	british	2023-03-05 12:46:33