andrewmkhoury

The latest version of this article now exists here instead: https://github.com/cqsupport/fix-instructions/blob/master/version-issues/

Old steps below:

Issue

When deleting versions from Apache Jackrabbit Oak you observe errors in the logs similar to the one below:

java.lang.NullPointerException: null

Jhyeok-lee

Default

Powerlevel9k

ChristopherA

Uninstall brew package and dependencies

Remove package's dependencies (does not remove package):

brew deps [FORMULA] | xargs brew remove --ignore-dependencies

Remove package:

aih

#/bin/sh
cd ~/.vim/bundle
for i in `\ls -p -d */`; do
  cd "$i"
  echo "Updating $i..."
  git pull --recurse-submodules | grep -v 'Already up-to-date' | sed 's/^/  /'
  [ -f .git/.gitmodules ] && git submodule update | sed 's/^/  /'
  cd ..
done

lukeplausin

# Count total EBS based storage in AWS
aws ec2 describe-volumes | jq "[.Volumes[].Size] | add"
# Count total EBS storage with a tag filter
aws ec2 describe-volumes --filters "Name=tag:Name,Values=CloudEndure Volume qjenc" | jq "[.Volumes[].Size] | add"
# Describe instances concisely
aws ec2 describe-instances | jq '[.Reservations | .[] | .Instances | .[] | {InstanceId: .InstanceId, State: .State, SubnetId: .SubnetId, VpcId: .VpcId, Name: (.Tags[]|select(.Key=="Name")|.Value)}]'
# Wait until $instance_id is running and then immediately stop it again
aws ec2 wait instance-running --instance-id $instance_id && aws ec2 stop-instances --instance-id $instance_id

# Get 10th instance in the account

tianchaijz

#list all ports for tcp
sudo lsof -itcp

#find all things listening on ports
lsof -Pnl +M -i4 | grep LISTEN

#all ports for tcp, dont resolve port name from numbers
sudo lsof -itcp -P

#open files and ports of process #$PID

warking

# Non-root account is recommended for this process

# centos-specific prepration
sudo yum -y update && sudo yum -y groupinstall 'Development Tools' && sudo yum -y install curl irb m4 ruby

# Sanitize the environment
PATH=~/.linuxbrew/bin:/usr/local/bin:/usr/bin:/bin
unset LD_LIBRARY_PATH PKG_CONFIG_PATH

# install linuxbrew

andrewmkhoury

AEM6.x Migration

• How to Rebuild a Pre-Existing AEM+Mongo Cluster
• or migrate from Tar to MongoDB or MongoDB to Tar"
• or migrate from 5.6.1 or 6.x to 6.x via data migration instead of jar upgrade

1. (Mongo to Mongo only) Remove one replica from the replica set and delete/recreate the db
   1. Remove the replica node from the set: http://docs.mongodb.org/master/tutorial/remove-replica-set-member/
   2. Validate that no other nodes in the set consider that node to be part of the set anymore. Log into each node in the cluster via mongo shell and run rs.status() to validate that the node that was taken out is not in the cluster any longer.
   3. Drop the aem database on that node http://docs.mongodb.org/manual/reference/command/dropDatabase/
2. Re-add the database with the correct user permissions (do not add the mongo instance back to the replica set)

joemaffia

Uninstall a bundle (use http://localhost:4505/system/console/bundles to access the Apache Felix web console)
        curl -u admin:admin -daction=uninstall http://localhost:4505/system/console/bundles/"name of bundle"

Install a bundle
        curl -u admin:admin -F action=install -F bundlestartlevel=20 -F 
        bundlefile=@"name of jar.jar" http://localhost:4505/system/console/bundles

Build a bundle
        curl -u admin:admin -F bundleHome=/apps/centrica/bundles/name of bundle -F 
        descriptor=/apps/centrica/bundles/com.centrica.cq.wcm.core-bundle/name_of_bundle.bnd 

wataruoguchi

Apache

How to make your website to maintenance mode

1. Put maintenance.html into your root directory

2. Open .htaccess file

3. Insert this block in the first line of the file

    ErrorDocument 503 /maintenance.html
    <IfModule mod_rewrite.c>
   

RewriteEngine On