Prometheus: Alertmanager’s alerts receivers and routing based on severity level and tags
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26 March 2019

We have three working environments – Dev, Stage, Production. Also, there are a bunch of alerts with different severities – info, warning и critical. For example: … – name: SSLexpiry.rules rules: – alert: SSLCertExpiring30days expr: probe_ssl_earliest_cert_expiry{job=”blackbox”} – time() < 86400 * 30 for: 10m labels: severity: info annotations: summary: “SSL certificate warning” description: “SSL certificate… Read More »

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Prometheus: Alertmanager – send alerts to a “/dev/null”
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26 March 2019

In addition to the Prometheus: Alertmanager’s alerts receivers and routing based on severity level and tags post. Have an Alertmanager config with routes. The task is – send all alerts from a Dev-environment into a “/dev/null”. To do this – create an empty receiver: … receivers: – name: ‘blackhole’ – name: ‘default’ slack_configs: – send_resolved:… Read More »

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What is: chroot – system call and utility in Linux
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23 March 2019

chroot() was added to the Version 7 Unix in 1979 and used for filesystem isolation. In fact, it’s the predecessor of the whole current containerization idea, just now there are namespaces and cgroups are used while earlier chroot was used to create an environment which is isolated from a host and can be used for… Read More »

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TestRail: QA Test Case Management installation on Linux
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22 March 2019

TestRail – Test Case Management Software for QA and Development Teams. Well – that’s all needed as a description) Below – its installation on Debian Linux with NGINX, Let’s Encrypt, PHP-FPM, MariaDB, and Exim. Project’s homepage – www.gurock.com/testrail Installation official documentation – here>>>. Setup will be on an AWS EC2. LEMP and SSL Login to… Read More »

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AWS: CLI named profiles
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19 March 2019

AWS CLI supports so-called named profiles stored in the configuration file .aws/config and ~/.aws/credentials file with keys which by default contains the… Well – the “default” profile. An additional profile can be added using the aws configure command with the –profile option. Here is an example of such file with already existing two profiles: [simterm]… Read More »

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Jenkins: Scripted Pipeline – Production environment job confirmation step
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19 March 2019

We have jobs which have to be executed on a Dev and Production environments via a Scripted Pipeline. In such jobs, there are tasks to execute CloudFormation upgrades on an infrastructure or Ansible playbooks to update servers configuration. To avoid an accidental execution of a Production job I want to have some confirmation step before… Read More »

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Monit: email alerting on an SSH logins
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18 March 2019

The task is to send an email alert when SSH-login was made from a not whitelisted IPs. Will use Monit here. Install it: [simterm] root@jenkins-dev:/home/admin# apt update && apt -y install monit [/simterm] Configure email settings: set localhost (we have a local eximhere), email’s format and email’s receiver. Edit the /etc/monit/monitrc file: … set mailserver localhost… Read More »

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Terraform: creating a project with an AWS EC2, VPC, and AWS cross-region VPC peering connection
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18 March 2019

One of the disappointing surprises in my AWS CloudFormation experience was the fact that it wasn’t able to automatically create cross-region VPC-peering connections. Note: this post originally was written in Rus on 28 June 2018 but now CloudFormation can do it, check the PeerRegion parameter of the AWS::EC2::VPCPeeringConnection resource. As a result – it tries… Read More »

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