script to enable sshd when it is not enabled by default

Author: andrewdelman

ECCO-ACCESS/Cloud_access_to_ECCO_datasets/sshd_enable.sh

@@ -0,0 +1,46 @@
+#!/bin/bash
+
+# # Script to enable ssh connections,
+# # on EC2 instances where they are disabled by default
+# # (e.g., with JPL AMIs).
+# # 
+# # Once this script runs successfully,
+# # it should be possible to login to the instance using ssh, e.g.:
+#
+# ssh -i "~/.ssh/your_key_pair.pem" jpluser@your_private_ip_address
+
+
+# Become root
+sudo -s
+ 
+# Try to enable sshd
+systemctl enable sshd
+if [ $? -eq 0 ]; then
+    echo "Enabled sshd successfully"
+else
+    if [ $( readlink -f /etc/systemd/system/sshd.service) = "/dev/null" ]; then
+        # Delete this /dev/null symlink 
+        rm -f /etc/systemd/system/sshd.service
+        echo 'Deleted symlink to /dev/null'
+         
+        # Re-try enabling sshd
+        systemctl enable sshd
+        if [ $? -eq 0] ; then
+            echo "Enabled sshd successfully"
+        else
+            echo "Error: symlink deletion did not allow sshd to be enabled"
+            exit 1
+    else
+        echo "Error: sshd not enabled successfully"
+fi
+ 
+# Create symlink to the service (if it does not already exist)
+ln -s /etc/systemd/system/multi-user.target.wants/sshd.service /usr/lib/systemd/system/sshd.service
+echo "Created symlink to sshd.service"
+ 
+# create new ssh keys
+ssh-keygen -q -N "" -t rsa -b 4096 -f /etc/ssh/ssh_host_rsa_key
+echo "Created new ssh keys"
+ 
+# start sshd service
+systemctl start sshd