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tinman alley Welcome to tinman alley! Featured Elon Musk jet tracker banned from Twitter Hypocrite Elon Musk has finally banned all Jet tracker accounts on Twitter, despite claiming that he supports freedom of expressions. Of course, the hypocrite only supports expression about things he agree with. In any case, Jet tracker has moved to Maston. Here https://mastodon.social/@elonjet Original article here: https://techcrunch.com/2022/12/14/elon-jet-the-twitter-account-tracking-elon-musks-flights-was-permanently-suspended/ Share this: Facebook LinkedIn Reddit Twitter Pocket Like this: Like Loading... Author tin Posted on December 14, 2022 December 16, 2022 Categories Facts , news , Tech Tags @elonjet , Elon Musk , Jet Trackers , Mastodon , twitter Leave a comment on Elon Musk jet tracker banned from Twitter Featured Supply chain attacks on open source Watch out if you are using libraries and code from public repositories. Supply chain attacks are (have been) on the rise. The latest one is on Rust. https://www.sentinelone.com/labs/cratedepression-rust-supply-chain-attack-infects-cloud-ci-pipelines-with-go-malware/ Share this: Facebook LinkedIn Reddit Twitter Pocket Like this: Like Loading... Author tin Posted on May 21, 2022 May 23, 2023 Categories SRE , SW Dev , Tech Tags golang , open source , rust , supply chain attacks Leave a comment on Supply chain attacks on open source Featured How To set limit on systemd services This is a cookbook style on how to set a limit (ulimit style) on your custom services that is managed by systemd. Usecase Why would you want to do something like this? You might be running on a small server (or instance if you are using cloud services) and want to prevent your application from affecting other services sharing that server (think of noisy neighbor problem). Generally, Linux kernel scheduler does a good job of fairly sharing system resources, but that is assuming you have a well behaved application. Sometime you want to pack applications tightly and don’t mind less performant applications. In summary, there are lots of reasons why you might want to tune the resources allocated to your applications. Luckily, if you are using systemd as the controller, you can take advantage of its capabilities. Note : There are some caveats. You need to be using a fairly recent kernel and Linux distrob, either Ubuntu/Debian or recent CentOS/RedHat/Fedora. What I am going to show you how to get cloudquery run under systemd on an Ubuntu 20.04 LTS. The reason that I want to do this is because cloudquery will use as much memory as it can and trigger Linux OOM killer. How There are 3 files needed: /etc/default/cloudquery This file contains definition for CQ_SERVICE_ACCOUNT_KEY_JSON, the value of which is the json content of your service account key file. Example: CQ_SERVICE_ACCOUNT_KEY_JSON='{ type”: service_account”, project_id”: foobar”, private_key_id”: 1a23b456cd134”, private_key”: —–BEGIN PRIVATE KEY—–\n…..vA8r\n—–END PRIVATE KEY—–\n”, client_email”:[email protected] ”, client_id”: 1234567890”, auth_uri”: https://accounts.google.com/o/oauth2/auth”, token_uri”: https://oauth2.googleapis.com/token”, auth_provider_x509_cert_url”: https://www.googleapis.com/oauth2/v1/certs”, client_x509_cert_url”: https://www.googleapis.com/robot/v1/metadata/x509/foobar-sa%40foobar.iam.gserviceaccount.com” }’ /lib/systemd/system/cloudquery_limit.slice [Unit] Description=Slice that limits memory for all my services [Slice] # MemoryHigh works only in unified” cgroups mode, NOT in hybrid” mode # Must add ‘systemd.unified_cgroup_hierarchy=1’ to GRUB_CMDLINE_LINUX_DEFAULT # in /etc/default/grub MemoryHigh=10240M # MemoryMax works in hybrid” cgroups mode, too MemoryMax=10240M /etc/systemd/system/cloudquery.service [Unit] Description=Cloud Query Documentation=cloudquery.README.md After=network.target [Service] Slice=cloudquery_limit.slice EnvironmentFile=-/etc/default/cloudquery ExecStart=/usr/local/bin/cloudquery –config /data/cq/config.hcl fetch ExecReload=/bin/kill -HUP $MAINPID KillMode=process Restart=on-failure RestartPreventExitStatus=255 Type=simple WorkingDirectory=/data/cq RuntimeDirectory=cq RuntimeDirectoryMode=0755 LimitNOFILE=64000 user=cloudquery group=cloudquery [Install] WantedBy=multi-user.target Alias=cloudquery.service Once you have all 3 files in place and edited the values to match your particular system, you need to tell systemd to check its directory for the new service, by running systemctl daemon-reload Once you have done that, you can check to see if systemd see your new service, by running systemctl list-unit-files|grep query Smoke Test Test to see if everything works by starting your service. systemctl start cloudquery Check (and debug) the status of your new service via systemctl status cloudquery and journalctl -xe Thanks to the posts from https://unix.stackexchange.com/questions/436791/limit-total-memory-usage-for-multiple-instances-of-systemd-service for pointing me in the right direction. Share this: Facebook LinkedIn Reddit Twitter Pocket Like this: Like Loading... Author tin Posted on February 2, 2022 May 1, 2024 Categories Cloud , Tech Tags cloudquery , systemd , ulimits Leave a comment on How To set limit on systemd services Meetup – Introduction to Quantum Computing Sillicon Valley – Santa Clara, CA Meetup https://www.meetup.com/santa-clara-quantum-computing-meetup-group/events/293607306 This is a simple first event in public interest to attract talents in Silicon Valley and globally to understand what is in store for with Quantum Computing as it evolves over next few years to become the next technology to change Computing , CommunicationsSensing that start trickling onto main stream Digital, Operations and Knowledge transformation. As a humble beginning like to introduce Quantum Logic and compare with Digital Logic to garner to see how one can leverage the cloud hosted free offerings from IBM, Google, Amazon and others to get informal education and see how this pans out as open technology for startups and hobbyist to innovate and use DIY way to build their skills for future opportunities. This will be a 18 week effort every Monday evening 6.30PM PDT / 9.30 PM EST / 7.00 AM IST for 1:30 hrs:mts. Ist and last week ie. 1st18th Monday will be Opening and closing events. So don’t miss the actions to become qualified to handle Quantum Technology. The easiest way to do will be have Subject introduction and follow up with interactions to set goals for one quarter and see how it shapes up. Doing this weekly for few weeks should help us consolidate and plan the course of actions. Share this: Facebook LinkedIn Reddit Twitter Pocket Like this: Like Loading... Leave a comment on Meetup – Introduction to Quantum Computing Minix anyone? I was cleaning my collection of documents, software…. ok, boxes and boxes of books, manuals, floppies, QIC tapes, DAT tapes and 8mm tapes…. When I found a box of and here is what’s inside the box. Wow, that brings back memories. Share this: Facebook LinkedIn Reddit Twitter Pocket Like this: Like Loading... Author tin Posted on January 23, 2022 January 23, 2022 Categories Uncategorized Tags linux , minix , technology Leave a comment on Minix anyone? Posts navigation Page 1 Page 2 … Page 18 Next page News Feeds Unit42 Threat Brief: Operation MidnightEclipse, Post-Exploitation Activity Related to CVE-2024-3400 (Updated May 3) Muddled Libra’s Evolution to the Cloud It Was Not Me! Malware-Initiated Vulnerability Scanning Is on the Rise Threat Brief: Vulnerability in XZ Utils Data Compression Library Impacting Multiple Linux Distributions (CVE-2024-3094) Exposing a New BOLA Vulnerability in Grafana Log in tinman alley Proudly powered by WordPress tinman alley Proudly powered by WordPress Theme: Twenty Sixteen. Loading Comments... You must be logged in to post a comment....