Month: May 2022

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Instances – AWS CLI

  1. aws ec2 describe-instances | jq -cr ‘.Reservations[].Instances[0]|[.InstanceId,.InstanceType,.KeyName,.State,.Tags]’ # list instances
  2. aws ec2 describe-instance-status –instance-id <INST-ID> | jq ‘ .InstanceStatuses | .[].InstanceState.Name’ # show instance
  3. aws ec2 start-instances –instance-id <INST-ID> # start instance
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LoadBalancers – AWS CLI

  1. aws elbv2 describe-load-balancers| jq -c ‘.LoadBalancers[]|[.LoadBalancerName,.LoadBalancerArn]’ # list arns
  2. aws elbv2 describe-listeners –load-balancer-arn <ARN>  | jq -c ‘.|.Listeners[]|[.Protocol,.Port,.ListenerArn] # list listeners
  3.  aws elbv2 describe-rules –listener-arn <ARN> | jq -c ‘.Rules[]|.Conditions,.Actions’ # list rules
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MongoDB Intro

  1. Connect to mongodb: $ mongo
  2. show dbs;
  3. db.<collection>.stats(1024000000) # gb – ref
  4. db.<collection>.find({},{<field>:<value>}).sort({<field>:1}).limit(5); # find top 5
  5. db.<collection>.find({},{<field>:1}).sort({<field>:-1}).limit(5); # find bottom 5
  6. db.<collection>.find({<field>:{ $lt: <val>}},{<field>:1}).count(); # count matches
  7. db.runCommand({compact:'<collection>’}) # compact collection