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Fix: mount --make-rshared /

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ufw default deny incoming
ufw default allow outgoing
ufw allow ssh
ufw enable

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defaults  
	...
	option httpclose  

became

defaults  
	...
	timeout client 5000 

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chown -R 472:472 /var/lib/grafana

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ip link add name docker0 type bridge
ip addr add dev docker0 172.17.0.1/16

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Safest way to clean up boot partition - Ubuntu 14.04LTS-x64

Reference

Case I: if /boot is not 100% full and apt is working

1. Check the current kernel version

$ uname -r 

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1. Delete old metrics of ours that haven't been written to for over 90 days
# just to satisfy my curiosity: how much disk space I will gain
find /data/db/whisper/ -name "*wsp" -mtime +90 -exec echo -n -e {}"\0" \; | du -hc --files0-from=-
# delete the files!
find /data/db/whisper/ -type f -mtime +90 -name "*wsp" -exec rm '{}' \;
2. Delete empty directories
# how many do we have?
find /data/db/whisper/ -type d -empty | wc -l
# remove them!
find /data/db/whisper/ -type d -empty -delete

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Docker - How to cleanup (unused) resources

Once in a while, you may need to cleanup resources (containers, volumes, images, networks) ...

delete volumes

// see: https://github.com/chadoe/docker-cleanup-volumes

$ docker volume rm $(docker volume ls -qf dangling=true)

$ docker volume ls -qf dangling=true | xargs -r docker volume rm

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containers:
- volumeMounts:
  - name: demo-config
    mountPath: /app/settings.json
    subPath: settings.json
volumes:
- name: demo-config
  configMap:
    name: demo

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ERROR! SERVER STOPPED 
our database migration failed:  
Database locked at version: 124 

Fix:
use rocketchat
db.migrations.update({_id: 'control'},{$set:{locked:false,version:125}})