tsunejui

Proxmox Template Creating Shell Script

src: https://www.apalrd.net/posts/2023/pve_cloud/

#!/bin/bash

#Create template
#args:
# vm_id

tsunejui

Test SMTP Server with curl

replace <smtp-server> with your host of SMTP server

replace <username> with your username

replace <password> with your password

curl \--ssl-reqd \--url 'smtp://<smtp-server>:2525' \

tsunejui

Create A Spring Boot Project With curl

curl https://start.spring.io/starter.tgz \
     -d type=maven-project -d language=java \
     -d platformVersion=3.1.5 -d packaging=jar \
     -d jvmVersion=21 -d groupId=com.rex \
     -d artifactId=observability \
     -d name=observability \
 -d description="Demo project for Spring Boot observability" \

tsunejui

Docker compose as a systemd unit

Create file /etc/systemd/system/docker-compose@.service. SystemD calling binaries using an absolute path. In my case is prefixed by /usr/local/bin, you should use paths specific for your environment.

[Unit]
Description=%i service with docker compose
PartOf=docker.service
After=docker.service

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NOTE: Guide to net/http timeouts

Although not explicitly stated, DNS resolution appears to be taken into consideration as part of the overall http.Client.Timeout setting. If you need to set your own DNS timeout, then it seems https://github.com/miekg/dns is a popular solution.

Additionally, it's important to realise how golang resolves hostnames to IPs (i.e. DNS resolution):
https://golang.org/pkg/net/#hdr-Name_Resolution

When cross-compiling binaries you'll find that CGO is typically disabled in favour of the native Go resolver. You can enforce CGO or native like so:

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# download this file to your project folder and excute
# chmod +x generate-ios.sh
# then run using
# ./generate-ios.sh

# flutter build defaults to --release
flutter build ios

# make folder, add .app then zip it and rename it to .ipa
mkdir -p Payload

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Process Review Command

ps -o pid,pidns,netns,mntns,ipcns,utsns,userns,args -p <pid>: take a look the details of the process

ps -o thcount <pid>: To get the number of threads for a given pid:

Podman Process

Placeholder list:

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oc patch clusterversion/version --type='merge' -p "$(cat <<- EOF
spec:
  overrides:
  - group: apps/v1
    kind: Deployment
    name: cluster-monitoring-operator
    namespace: openshift-monitoring
    unmanaged: true
EOF
)"

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#!/bin/sh
#===================================================================================
#
# FILE: dump.sh
# USAGE: dump.sh [-i interface] [tcpdump-parameters]
# DESCRIPTION: tcpdump on any interface and add the prefix [Interace:xy] in front of the dump data.
# OPTIONS: same as tcpdump
# REQUIREMENTS: tcpdump, sed, ifconfig, kill, awk, grep, posix regex matching
# BUGS:  ---
# FIXED: - In 1.0 The parameter -w would not work without -i parameter as multiple tcpdumps are started.

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# src: https://serverfault.com/a/928394
ip -details link show |awk '/^[0-9]+:/ { line=NR; printf "\n%s ",gensub("(@.*|:)$","",1,$2) } NR == line+2 { printf "%s",$1 } END { printf "\n" }'

# src: https://unix.stackexchange.com/q/272850
ip -details -j l | jq -r '.[]|"\(.ifname), \(.link_type), \(.linkinfo.info_data.type), \(.linkinfo.info_kind), \(.linkinfo.info_slave_kind)"' | column -t -s ','

or 

ip -details -j link show | jq -r '.[] | "\(.ifname), \(.linkinfo | .info_kind)"' | column -s ',' -t