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On AWS EC2 instance, use data from [Instance Metadata Service version 2](https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/configuring-instance-metadata-service.html) in bash
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| python3 -c "from datetime import datetime; pt=lambda s: datetime.strptime('2001,1'+s, '%Y,%j+%H:%M:%S'); t0=pt('0+20:28:33'); t1=pt('1+01:09:07'); print(t0); print(t1); dt=t1-t0; print(dt)" | |
| deltatime() { python3 -c "from datetime import datetime; pt=lambda s: datetime.strptime('2001,1'+s, '%Y,%j+%H:%M:%S'); t0=pt('$1'); t1=pt('$2'); print(t0); print(t1); dt=t1-t0; print(dt)" } | |
| $ deltatime '0+20:28:33' '1+01:09:07' | |
| 2001-01-10 20:28:33 | |
| 2001-01-11 01:09:07 | |
| 4:40:34 |
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| #!/bin/bash | |
| IMDS2TOKEN=$(curl -s -X PUT "http://169.254.169.254/latest/api/token" -H "X-aws-ec2-metadata-token-ttl-seconds: 21600") | |
| metadata() { curl -s -H "X-aws-ec2-metadata-token: $IMDS2TOKEN" "http://169.254.169.254/latest/meta-data/$1"; } | |
| metahtml() { | |
| cat <<EOF | |
| <!DOCTYPE html> | |
| <html> | |
| <center> | |
| <body bgcolor="black" text="#39ff14" style="font-family: Arial"> | |
| <h1>Metadata Demo</h1> | |
| <h3>Availability Zone: $(metadata placement/availability-zone)</h3> | |
| <h3>Instance Id: $(metadata instance-id)</h3> | |
| <h3>Public IP: $(metadata public-ipv4)</h3> | |
| <h3>Local IP: $(metadata local-ipv4)</h3> | |
| </body> | |
| </center> | |
| </html> | |
| EOF | |
| } | |
| metahtml | |
| metahtml >/var/www/html/index.html |
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| # AWS records Tags data using a structure that's a bit harder to work with. | |
| # Adapted from https://stackoverflow.com/a/70433794/2327973 | |
| aws ec2 describe-instances >instances.json | |
| jq <instances.json -r '.Reservations[].Instances[] | ((.Tags // empty) | from_entries) as $tags | [($tags.Name), ($tags.UserId), .ImageId, .InstanceId, .PublicIpAddress] | @csv' |
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| #!/bin/bash | |
| # Calculate the difference between two dates | |
| # Usage: subdate FIRST_DATE SECOND_DATE | |
| # Examples: | |
| # subdate 2024-10-06 today | |
| # subdate "Apr 06 04:00:00" "Apr 06 22:42:06" | |
| case $(uname -s) in | |
| Linux) | |
| date=date | |
| ;; | |
| Darwin) | |
| date=gdate | |
| ;; | |
| CYGWIN*|MINGW32*|MSYS*) | |
| date=gnudate | |
| ;; | |
| *) | |
| echo "Unknown OS" | |
| exit 1 | |
| ;; | |
| esac | |
| d1=$($date +%s -d "$1") | |
| d2=$($date +%s -d "$2") | |
| diff=$(( d2 - d1 )) | |
| printf '%02ds=%02dd%02dh%02dm%02ds\n' $diff $((diff/86400)) $((diff%86400/3600)) $((diff%3600/60)) $((diff%60)) |
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