Firstly you need to create webhook url in slack. How to do it you can find at https://www.programmableweb.com/news/how-to-integrate-webhooks-slack-api/how-to/2015/10/20
Secondly you need for example a bash script. My version you can find in gist:
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| #!/bin/sh | |
| # Usage: date | sh slackpost.sh | |
| # Usage: echo "Hello Word" | sh slackpost.sh | |
| webhook_url=https://hooks.slack.com/services/……………… | |
| username="PI" | |
| channel=logs | |
| icon_emoji=":ghost:" # https://slackmojis.com/ | |
| #load all message to var | |
| while read LINE; do | |
| text="$text\n$LINE" | |
| done | |
| #Default validation | |
| if [ "$webhook_url" = "" ]; then | |
| echo "No webhook_url specified" | |
| exit 1 | |
| fi | |
| if [ "$channel" = "" ]; then | |
| echo "No channel specified" | |
| exit 1 | |
| fi | |
| if [ "$text" = "" ]; then | |
| echo "No text specified" | |
| exit 1 | |
| fi | |
| escapedText=$(echo $text | sed 's/"/\"/g' | sed "s/'/\'/g" ) | |
| json="{\"channel\": \"$channel\",\"username\": \"$username\",\"icon_emoji\": \"$icon_emoji\",\"text\": \"$escapedText\"}" | |
| #by success returned 'ok' | |
| status="$(curl -s -d -X POST –silent –data-urlencode "payload=$json" "$webhook_url")" | |
| if [ "$status" != "ok" ]; then | |
| # there were problems at curl request | |
| # place to log error | |
| echo "curl error" | |
| fi |
For comfort usage I have copied it to bin folder
cp /current/path/to/slackpost.sh /usr/local/bin/slackpost.sh chmod +x /usr/local/bin/slackpost.sh
Now you cant access this script anywhere by typing :
command_with_textual_output | slackpost.sh
Practically you can use it to get info about errors or notifications. Maybe you want to get notification about successfully database backup.
#sh way
echo "Your database backup was created successfully" | slackpost.sh
#python way
os.system("echo 'Your database backup was created successfully' | slackpost.sh")
Personaly I’m using it for notifying me if any of monitored website is offline – https://mindau.de/blog/en/simple-way-monitor-websites-linux/
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