Kudos to https://www.reddit.com/r/linux/comments/1y8qg2/can_i_force_a_process_to_flush_a_file_descriptor/
Re-confirmed the trick with Ubuntu 26.04 - answer is still relevant, thanks!
FWIW, reproduced with a simple program that prints a message without \n so it is not flushed until the process is closed (or buffer fills up), and sleeps:
// ppp.c
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
The client implementations in libupsclient (C), libnutclient (C++), PyNUT (Python), Nut.pm (Perl), and jNut (Java) were audited against the NUT network protocol defined in docs/net-protocol.txt.
The C library is the most mature and complete implementation, used by most core NUT utilities (upsc, upscmd, upsrw, upsmon).
GET, LIST, SET, INSTCMD, LOGIN, LOGOUT, USERNAME, PASSWORD, VER, NETVER, HELP, STARTTLS, PRIMARY/MASTER, FSD.GET (VAR, TYPE, DESC, CMDDESC, UPSDESC, NUMLOGINS) and LIST (UPS, VAR, RW, CMD, ENUM, RANGE, CLIENT).upscli_sslinit and upscli_tryconnect.TRACKING support (GET/SET TRACKING).
| #!/bin/sh | |
| # Toggle Jenkins agent(s) running on local system on and off | |
| # (e.g. free up CPU when needed for something else temporarily). | |
| # | |
| # (C) 2026 Jim Klimov <jimklimov+nut@gmail.com> | |
| # | |
| # Posted at https://gist.github.com/jimklimov/e8841ff5bbcf6a23a8ece7fe7cb53eb9 | |
| # Inspired by discussion at | |
| # https://stackoverflow.com/questions/61389821/get-running-build-status-on-a-given-jenkins-worker-node |
Specifying a zero size for filesystem lets LXC backend use the "subvol" directories rather than disk images. The latter were problematic for "pxvirt" 9.0.10-2 on Raspberry/trixie with ZFS (there raw ext4 images are okay for direct fsck/mount, until PVE mounts them and the system locks up with timed-out processes).
GUI may forbid specifying 0 as disk size, CLI to the rescue then.
Thanks to https://forum.proxmox.com/threads/proxmox-4-lxc-chroot-instead-of-raw-images.22881/ for CLI examples:
pct create 110 /var/lib/vz/template/cache/ubuntu-14.04-standard_14.04-1_amd64.tar.gz -hostname servername -password 'p@ssw0rd' -rootfs local:0
Comparing two setups:
| <!DOCTYPE html><html> | |
| <link rel="stylesheet" href="https://cdn.oaistatic.com/assets/root-dxedo8gg.css"/><link rel="stylesheet" href="https://cdn.oaistatic.com/assets/conversation-small-c80izxqg.css"/> | |
| <body style="background-color:#404040"> | |
| <div style="background-color:#404040" class="flex flex-col text-sm thread-xl:pt-header-height pb-25"><article class="text-token-text-primary w-full focus:outline-none [--shadow-height:45px] has-data-writing-block:pointer-events-none has-data-writing-block:-mt-(--shadow-height) has-data-writing-block:pt-(--shadow-height) [&:has([data-writing-block])>*]:pointer-events-auto scroll-mt-(--header-height)" tabindex="-1" dir="auto" data-turn-id="76b36e2a-fced-457d-9e2b-7435b6d37214" data-testid="conversation-turn-1" data-scroll-anchor="false" data-turn="user"><h5 class="sr-only">You said:</h5><div class="text-base my-auto mx-auto pt-3 [--thread-content-margin:--spacing(4)] thread-sm:[--thread-content-margin:--spacing(6)] thread-lg:[--thread-content-margin:--spacing(16)] |
| // From https://community.jenkins.io/t/random-403-invalid-crumb-messages-through-out-jenkins/35619/4 | |
| // by @poddingue - Bruno Verachten, GSoC Mentors | |
| import jenkins.model.Jenkins | |
| import hudson.security.csrf.CrumbIssuer | |
| import jenkins.security.s2m.AdminWhitelistRule | |
| def j = Jenkins.instance | |
| println "=== Jenkins Security & CSRF Diagnostics ===" |
| // requires Simple Queue Plugin : https://plugins.jenkins.io/simple-queue/ | |
| // run this in Jenkins console to generate shell code | |
| // create a token in sysadmin account, save as e.g. `~/.sq` in a trusted workstation | |
| // and in a shell session define JENKINS_URL="https://USERNAME:`cat ~/.sq`@SERVERNAME" | |
| // then paste the result of script below (tweak "it" matcher to your needs) | |
| def q = Jenkins.instance.queue | |
| def pattern = ~/.*jobname.*1234.*/ | |
| def ACTION = "DOWN_FAST" | |
| //def ACTION = "UP_FAST" |
| #!/bin/sh | |
| # https://superuser.com/questions/1582234/make-ip-address-of-wsl2-static/1808525#1808525 | |
| # https://superuser.com/a/1723531/433945 | |
| # Add to /etc/wsl.conf as boot/command="/root/network-start.sh" for autostart | |
| # (C) 2023-2025 by Jim Klimov (and other SO/GH/blog authors) | |
| # | |
| # This script assigns a fixed IP to the VM, fixes up DNS, | |
| # allows fixed port on host for SSH dial-back into the VM | |
| # and starts the SSH server. |
| # 1) Jenkins uses XML 1.1 standard that did not pick up in the industry after 20 years. | |
| # So browsers and xmllint claim they do not know of it: https://stackoverflow.com/a/4508357 | |
| # Jenkins docs suggest replacing with "1.0" should suffice: https://www.jenkins.io/doc/upgrade-guide/2.107/ | |
| # 2) changelogNNNNNNNNNN.xml files are not XML but git commit info in fact | |
| # 3) Some of those are plain empty and upset xmllint | |
| # 4) xmllint insists on having an input file, so after rewrites we give it /dev/stdin. | |
| # This path name may be a feature of bash and/or certain platforms. | |
| find . -name '*.xml' | while read F ; do | |
| [ -s "$F" ] || continue; |
| Jenkins.instance.getAllItems(org.jenkinsci.plugins.workflow.job.WorkflowJob).each { def project -> | |
| //def flow = project.getDefinition() | |
| //println "=== ${project.fullName}" // + " => ${flow} => ${flow.getDescriptor()}" | |
| // + " - " + project.properties | |
| def brProp = project.getProperty(org.jenkinsci.plugins.workflow.multibranch.BranchJobProperty.class) | |
| def br = brProp?.getBranch() | |
| def brScm = br?.getScm() | |
| //println " * ${brScm && brScm instanceof hudson.plugins.git.GitSCM ? brScm.getScmName() : brScm} => ${br?.getName()} => ${br?.getHead()} => ${br?.getSourceId()}" | |
| if (brScm && brScm instanceof hudson.plugins.git.GitSCM) { |