AWS EC2 User Data create SH script

Question

I'm creating a new instance in AWS and adding some user data, but part of the job is to create an sh file and then executed.

I'm trying:

#!/bin/bash -x
cd /tmp
INSTANCE_ID=$(curl http://169.254.169.254/latest/meta-data/instance-id)
sudo wget -O ethminer.tar.gz https://github.com/ethereum-mining/ethminer/releases/download/v0.18.0/ethminer-0.18.0-cuda-9-linux-x86_64.tar.gz
sudo tar xvfz ethminer.tar.gz
cd bin
cat > runner.sh << __EOF__
#!/bin/bash -x
SERVERS=(us1 us2 eu1 asia1)
while (true); do
  PREFERRED_SERVER=\${!SERVERS[\${!RANDOM} % \${!#SERVERS[@]}]}
  ./ethminer \
    -P stratums://xxx.${!INSTANCE_ID}@\${!PREFERRED_SERVER}.ethermine.org:5555 \
    -P stratums://xxx.${!INSTANCE_ID}@us1.ethermine.org:5555 \
    -P stratums://xxx.${!INSTANCE_ID}@us2.ethermine.org:5555 \
    -P stratums://xxx.${!INSTANCE_ID}@eu1.ethermine.org:5555 \
    -P stratums://xxx.${!INSTANCE_ID}@asia1.ethermine.org:5555 \
  >> /tmp/ethminer.log 2>&1
done
__EOF__
sudo chmod +x runner.sh
sudo nohup ./runner.sh &

Everything works except the sh, my command creates the runner.sh script but it is empty.

Are you sure this works when you write "Everything works "? This script will just hang on `sudo apt update` and `sudo apt install nvidia-cuda-toolkit` waiting for user confirmations. — Marcin, Jan 22 '21 at 06:03
Just Edited the example since the issue is in the runner.sh which is not working — alexmorgan.cr, Jan 22 '21 at 06:09

score 0 · Accepted Answer · answered Jan 22 '21 at 06:36

The UserData does not work because its is designed from CloudFormation, thus it has incorrect syntax for use in a standalone instance. The script with correct syntax is below and it will generate your runner.sh. I haven't tested runner's functionality, only the creation of the runner.sh.

#!/bin/bash -x
cd /tmp
INSTANCE_ID=$(curl http://169.254.169.254/latest/meta-data/instance-id)
sudo wget -O ethminer.tar.gz https://github.com/ethereum-mining/ethminer/releases/download/v0.18.0/ethminer-0.18.0-cuda-9-linux-x86_64.tar.gz
sudo tar xvfz ethminer.tar.gz
cd bin
cat > runner.sh << __EOF__
#!/bin/bash -x
SERVERS=(us1 us2 eu1 asia1)
while (true); do
  PREFERRED_SERVER=\${SERVERS[\${RANDOM} % \${#SERVERS[@]}]}
  ./ethminer \
    -P stratums://xXX.${insTANCE_ID}@\${PREFERRED_SERVER}.ethermine.org:5555 \
    -P stratums://xxx.${INSTANCE_ID}@us1.ethermine.org:5555 \
    -P stratums://xxx.${INSTANCE_ID}@us2.ethermine.org:5555 \
    -P stratums://xxx.${INSTANCE_ID}@eu1.ethermine.org:5555 \
    -P stratums://xxx.${INSTANCE_ID}@asia1.ethermine.org:5555 \
  >> /tmp/ethminer.log 2>&1
done
__EOF__
sudo chmod +x runner.sh
sudo nohup ./runner.sh &

AWS EC2 User Data create SH script

1 Answers1