I do a lot of work on ec2 instances, and one thing that makes this
easier is having a few scripts for manipulating them. These are very
small, small enough to go in my .bashrc, but still make
my life a lot easier.
The first one is start_ec2:
alias start_ec2=‘aws ec2 start-instances—instance-ids i-NNNN’
I have an instance I do most of my work on, and this command starts
it. Way better than logging into the AWS Console like I used to do.
After a few seconds I run:
function ssh_ec2() {
ADDR=”$(aws ec2 describe-instances \
--instance-ids i-NNNN \
--query ‘Reservations[].Instances[].PublicDnsName’
--output text)”
if [ $? != 0 ] || [ -z “$ADDR” ]; then
echo “Instance not running.”
return
fi
scp “ec2-user@$ADDR:.full_history” \
/path/to/ec2-full-history-backup.txt
ssh “ec2-user@$ADDR”
}
This figures out the IP of the instance, copies down my (very
important) full
shell history, and logs me in over ssh.
I don’t have a command for shutting down remotely: I just run
sudo shutdown -h now while logged in.
The last command, and probably my favorite, is
resize_ec2:
For example, resize_ec2 c6a.xlarge or
resize_ec2 c6a.32xlarge. Depending on what I’m doing I
might need very different specs, and I don’t want to pay $4.90/hr when
I only need a $0.15/hr machine. It does take a mildly annoying few
minutes for a machine that has just shut down to transition into a
state where you can resize it, but it’s not too bad.
EC2 Scripts
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I do a lot of work on ec2 instances, and one thing that makes this easier is having a few scripts for manipulating them. These are very small, small enough to go in my
.bashrc, but still make my life a lot easier.The first one is
start_ec2:I have an instance I do most of my work on, and this command starts it. Way better than logging into the AWS Console like I used to do.
After a few seconds I run:
function ssh_ec2() { ADDR=”$(aws ec2 describe-instances \ --instance-ids i-NNNN \ --query ‘Reservations[].Instances[].PublicDnsName’ --output text)” if [ $? != 0 ] || [ -z “$ADDR” ]; then echo “Instance not running.” return fi scp “ec2-user@$ADDR:.full_history” \ /path/to/ec2-full-history-backup.txt ssh “ec2-user@$ADDR” }This figures out the IP of the instance, copies down my (very important) full shell history, and logs me in over ssh.
I don’t have a command for shutting down remotely: I just run
sudo shutdown -h nowwhile logged in.The last command, and probably my favorite, is
resize_ec2:function resize_ec2j() { aws ec2 modify-instance-attribute \ --instance-id i-NNNN \ --instance-type “$1” }For example,
resize_ec2 c6a.xlargeorresize_ec2 c6a.32xlarge. Depending on what I’m doing I might need very different specs, and I don’t want to pay $4.90/hr when I only need a $0.15/hr machine. It does take a mildly annoying few minutes for a machine that has just shut down to transition into a state where you can resize it, but it’s not too bad.