Create a file on remote server using ssh

Question

I want to create a file on a remote server using ssh but I am not able to do so. I have 3 remote server and I am writing a bash script to create files on each of them.

The command I am using is:

`ssh $1@$2 > /etc/kafka/kafka_2.11-0.9.0.0/config/test.sh <<EOL
broker.id=$3
listeners=$4
num.network.threads=3
num.io.threads=8
socket.send.buffer.bytes=102400
socket.receive.buffer.bytes=102400
socket.request.max.bytes=104857600
log.dirs=/tmp/kafka-logs
num.partitions=1
num.recovery.threads.per.data.dir=1
log.retention.hours=168
log.segment.bytes=1073741824
log.retention.check.interval.ms=300000
log.cleaner.enable=false
zookeeper.connection.timeout.ms=6000
delete.topic.enable=true
ssl.client.auth=required
security.inter.broker.protocol=SSL

EOL`

but it does not seem to work.

as an alternative, consider creating a file on your machine and copy it with scp myfile username@remotehost:/the/place/to/copy to the remote host — selyunin
– selyunin, Commented Mar 7, 2016 at 13:44
ya i thought of that option but was wondering why this is not working. And actually it is a properties file which is used to start the program so didn't wanted to keep changing it and then scp it — Vishesh
– Vishesh, Commented Mar 7, 2016 at 13:45
Do you use your snippet somewhere in your script? Do you have a password-free access to your remote host (i.e. id_rsa.pub copied to the remote server). Otherwise you probably need to authorize on the remote host and that's probably why you — selyunin
– selyunin, Commented Mar 7, 2016 at 13:48
selyunin , yes i have id_rsa.pub. Actully all VM are in a cloud space so provisioning is done — Vishesh
– Vishesh, Commented Mar 7, 2016 at 13:50

Community · Accepted Answer · 2017-05-23 10:28:02Z

The following code should work for you:

cat <<EOL | ssh $1@$2 'cat > /etc/kafka/kafka_2.11-0.9.0.0/config/test.sh'
broker.id=$3
listeners=$4
num.network.threads=3
num.io.threads=8
socket.send.buffer.bytes=102400
socket.receive.buffer.bytes=102400
socket.request.max.bytes=104857600
log.dirs=/tmp/kafka-logs
num.partitions=1
num.recovery.threads.per.data.dir=1
log.retention.hours=168
log.segment.bytes=1073741824
log.retention.check.interval.ms=300000
log.cleaner.enable=false
zookeeper.connection.timeout.ms=6000
delete.topic.enable=true
ssl.client.auth=required
security.inter.broker.protocol=SSL

EOL

The first cat command takes its input from the here document (provided by the shell which expands the positional parameters, $3 and $4) and its output is piped into the ssh command.

The cat > /etc/kafka/kafka_2.11-0.9.0.0/config/test.sh command is single-quoted as it should all be parsed as a single argument for the ssh command. If it’s not quoted, only the cat command by itself would be passed to the ssh command and the shell would parse the > as an instruction to redirect the output of the ssh command to a local file. This cat command runs on the remote server and gets its input from the ssh connection (if a filename isn’t specified as an operand for a cat command, it uses standard input instead).

The above command is actually a useless use of cat but I thought it might be easier for a shell-scripting newcomer to follow. You can actually shorten the first line by redirecting input for the ssh command directly from the here document:

ssh $1@$2 'cat > /etc/kafka/kafka_2.11-0.9.0.0/config/test.sh' <<EOL

This will work for Bash and other POSIX (standards-compliant) shells.

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