If there is a command that needs to run on startup/reboot, you can use the @reboot directive in cron to schedule it. Here is a simple example of logging the date to a file at startup. (crontab -l 2>/dev/null; echo “@reboot date >> ~/startup.log”) | sort -u | crontab – The sort command avoids duplicate … Bash: schedule a command that will be run at reboot using cron
Bash scripts will often assume that they are being invoked from the same directory where they are located. The script may use relative paths to configuration files or logs that it expects. The problem is that one cannot assume that the directory a script lives in is necessarily the one it is being invoked from. … Bash: current directory versus directory of script
You can bake a startup script directly into the creation of your EC2 instance when using Terraform. Although complex post-configuration should be left to tools such as Ansible, essential bootstrap type commands or custom routes for instances in private subnets are reasons why you might need to use this hook. Below is an example of … Terraform: invoking a startup script for an EC2 aws_instance
The Putty suite contains several executables beyond the main application. It also has pscp.exe, a command line scp client, and plink.exe which is a command line ssh client. These clients can be used to run file transfers and commands against hosts in console mode, perfect for automation of repetitive tasks.
WinSCP is a Windows application for transferring files via fto or scp to remote host. A feature not many take advantage of is the ability to create automation scripts that can execute these transfers as silent batch jobs. In this article I will show how to use scripted FTP commands and SCP commands to automate … WinSCP: Automated file transfer from a Windows host
Zabbix low-level discovery (LLD) provides a way to create an array of related items, triggers, or graphs without needing to know the exact number of entities up front. The easiest way to populate the keys of a discovery item is to add a “UserParameter” in zabbix_agentd.conf, and then the Zabbix agent will invokes a script which returns the set … Zabbix: LLD low-level discovery returning multiple values
The Go language with its simplicity, concurrency support, rich package ecosystem, and ability to compile down to a single binary is an attractive solution for writing services on Ubuntu. However, the Go language does not natively provide a reliable way to daemonize itself. In this article I will describe how to take a couple of simple Go language programs, … GoLang: Running a Go binary as a SysV service on Ubuntu 14.04
Logstash has a rich set of filters, and you can even write your own, but often this is not necessary since there is a out-of-the-box filter that allows you to embed Ruby code directly in the configuration file. Using logstash-filter-ruby, you can use all the power of Ruby string manipulation to parse an exotic regular expression, … ELK: Using Ruby in Logstash filters
Selenium is an open-source solution for automating the browser allowing you to run continuous integration tests, validate performance and scalability, and perform regression testing of web applications. This kind of automated testing is useful not only from desktop systems, but also from server machines where you may want to monitor availability or correctness of returned … Selenium: Running headless automated tests on Ubuntu