Q: How to add the -k parameter to achieve non-interactive execution?#
cd /var/tmp/ansible_test
ansible-playbook -i env/hosts_testB site.yml --tags hsop-tps-access,hsop-tps-otps
A:
Child, you can use the following command to add the "-k" parameter to achieve password-based SSH login in non-interactive mode:
cd /var/tmp/ansible_test
ansible-playbook -i env/hosts_testB site.yml --tags hsop-tps-access,hsop-tps-otps -k
When running this command, it will prompt you to enter the password for SSH login. Please note that to make this method work, you need to ensure that the SSH login password is the same as the login password for the target host. However, since the password is transmitted in plain text in the command, this method is not secure. Therefore, it is recommended to configure SSH public key authentication for more secure operations.
Q: How to configure SSH public key authentication?#
A:
Child, configuring SSH public key authentication can increase security and allow passwordless SSH login. Here are the steps to configure SSH public key authentication:
Generate SSH key pair. Open the terminal on your local computer and run the following command:
ssh-keygen -t rsa
Follow the prompts to choose the location to save the key and set a password (if needed).
Copy the public key to the target host. Run the following command to copy the public key to the target host, replacing "username" with your username and "hostname" with the hostname or IP address of the target host:
ssh-copy-id username@hostname
It will prompt you to enter the password for the target host once.
Verify public key authentication. Run the following command to test if SSH public key authentication is successful:
ssh username@hostname
If everything is fine, you should be able to log in to the target host directly without entering a password.
Remember, child, configuring SSH public key authentication can improve security, but you still need to protect your private key and ensure that others cannot access your private key file.
Q: Why is it not working? Still need to enter a password.#
ssh-copy-id [email protected]
[email protected]'s password:
Now try logging into the machine, with "ssh '[email protected]'", and check in:
.ssh/authorized_keys
to make sure we haven't added extra keys that you weren't expecting.
ssh '[email protected]'
[email protected]'s password:
A:
Child, if you still need to enter a password when trying to SSH login after running the ssh-copy-id command, it may be due to the following reasons:
No .ssh folder created on the target host. Please make sure that a folder named .ssh exists on the target host. If it doesn't exist, you can create the folder manually (e.g., by executing the command mkdir ~/.ssh).
Incorrect permissions for the .ssh folder. Please ensure that the .ssh folder has the correct permissions of 700 (e.g., by executing the command chmod 700 ~/.ssh).
Incorrect permissions for the authorized_keys file. Please ensure that the .ssh folder on the target host contains a file named authorized_keys and that its permissions are set to 600 (e.g., by executing the command chmod 600 ~/.ssh/authorized_keys).
If you have completed the above steps but still need to enter a password to log in to the target host, it may be a configuration issue with the sshd service. Please check if the sshd_config file on the target host is configured correctly and make sure the PubkeyAuthentication parameter is enabled.
Good luck!
Q: Still not working? Why?#
ssh '[email protected]'
[email protected]'s password:
A:
Oh dear, this is a really frustrating problem! If you have tried the previously mentioned solutions but still can't get SSH login to work without entering a password, there may be other reasons causing the public key authentication to not work properly.
Here are some possible reasons and solutions:
Key file and permissions: Make sure your SSH key files are in the correct location (usually ~/.ssh/id_rsa or ~/.ssh/id_dsa) and have the correct permissions. The private key file should have permissions of 600 (-rw-------) or stricter, while the public key file should have permissions of 644 (-rw-r--r--) or more relaxed.
Authorized Keys file and permissions: Verify that your SSH public key has been correctly added to the authorized_keys file on the target host. This file is usually located at ~/.ssh/authorized_keys. Make sure the permissions for this file are set to 600 (-rw-------) or stricter.
SSH service restart: After making any SSH configuration changes, it's important to restart the SSH service to apply the changes. You can do this by running the following command:
sudo systemctl restart sshd
Firewall settings: Check your firewall settings to ensure that the SSH service's port (usually 22) is open and that there are no outbound rules blocking SSH connections.
If you have tried the above solutions and still can't resolve the issue, it may require further troubleshooting. You can try checking the SSH logs on the target host (usually located in /var/log/auth.log or /var/log/secure) for more error information, or continue consulting with a system administrator or technical support for assistance.
I hope your SSH issue gets resolved soon!
Q: How to view if the PubkeyAuthentication parameter is enabled in the sshd_config file on the target host?#
A:
To view if the PubkeyAuthentication parameter is enabled in the sshd_config file on the target host, you can use the following command:
sudo cat /etc/ssh/sshd_config | grep PubkeyAuthentication
This command will read the /etc/ssh/sshd_config file and search for the line that contains PubkeyAuthentication. If this parameter is set to yes, then public key authentication is enabled.
Please make sure you have the appropriate permissions to execute this command. If you are not the root user, you may need to use sudo or contact an administrator for access.
I hope this helps you find out the status of the PubkeyAuthentication parameter!
Q: It is commented as "#PubkeyAuthentication yes". How to handle it?#
A:
cat /etc/ssh/sshd_config | grep PubkeyAuthentication
#PubkeyAuthentication yes
If you find that the line with PubkeyAuthentication in the sshd_config file on the target host is commented with a "#" symbol, it means that this parameter is currently disabled. To enable public key authentication, you need to uncomment it by changing "#PubkeyAuthentication yes" to "PubkeyAuthentication yes".
You can use any text editor to modify the sshd_config file, such as nano:
sudo nano /etc/ssh/sshd_config
In this editor, find the line with PubkeyAuthentication and remove the "#" symbol, save the file, and exit. Then, restart the ssh service to apply the changes:
sudo systemctl restart sshd
Now you should be able to use public key authentication for SSH login. Good luck!
Q: How to restart sshd on Oracle Linux Server release 6.7?#
A:
On Oracle Linux Server 6.7, you can restart the sshd service using the following command:
sudo service sshd restart
This command will attempt to restart the sshd service and apply any changes. If the service is not currently running, it will be started.
Please note that in Oracle Linux Server, there may be different tools to control services, such as systemctl, but in versions 6.7 and earlier, systemctl may not be available or fully supported. Therefore, using the service command may be more appropriate for your version.
I hope this helps you restart the sshd service!
Q: "Find the line with PubkeyAuthentication and remove the "#" symbol" doesn't work. Why does another machine have PubkeyAuthentication enabled without any issues? Help analyze other possible reasons.#
A:
If you have found the line with PubkeyAuthentication in the sshd_config file on the target host and uncommented it, but the problem still persists, there may be other reasons causing public key authentication to not work properly.
Here are some possible reasons and solutions:
Key file and permissions: Make sure your SSH key files are in the correct location (usually ~/.ssh/id_rsa or ~/.ssh/id_dsa) and have the correct permissions. The private key file should have permissions of 600 (-rw-------) or stricter, while the public key file should have permissions of 644 (-rw-r--r--) or more relaxed.
Authorized Keys file and permissions: Verify that your SSH public key has been correctly added to the authorized_keys file on the target host. This file is usually located at ~/.ssh/authorized_keys. Make sure the permissions for this file are set to 600 (-rw-------) or stricter.
Account permissions on the target host: Ensure that the account (e.g., appuser) on the target host has the appropriate home directory permissions and .ssh folder permissions.
If you have tried the above solutions and still cannot resolve the issue, it may require further troubleshooting. You can try checking the system logs (such as /var/log/secure or /var/log/auth.log) on the target host for more detailed information about the authentication failure reasons.
I hope this information helps you! If you have any further questions, feel free to ask.
Q: Why can't I find "system logs (such as /var/log/secure or /var/log/auth.log)"?#
A:
If you cannot find system log files such as /var/log/secure or /var/log/auth.log on your system, there may be several reasons:
Different log file paths: Different operating systems and distributions may store system logs in different locations. You can use the command ls /var/log/ in the terminal to see the existing log files. Alternatively, you can search the internet for your specific operating system and distribution to find out the default system log file paths.
Permission issues: If you are logged into the system as a non-root user, you may not have permission to view system logs. You can try executing the relevant commands as the root user or contact an administrator for access.
System has disabled system logging: Some systems may have system logging disabled. The system administrator may have disabled these features. If you cannot find log files and you are sure you are logged in as the root user, consult with the system administrator for more information.
If you cannot find system log files, try exploring other avenues to address the current issue. You can search the internet for more information and solutions related to the problem you are encountering. If you have any other questions, feel free to ask me.
Q: Why can't I find "system logs (such as /var/log/secure or /var/log/auth.log)" on Oracle Linux Server release 6.7?#
A:
On Oracle Linux Server 6.7, the system log files are located in /var/log/secure or /var/log/messages. If you cannot find these files in that location, you can try running the following command:
sudo service rsyslog restart
This command will restart the rsyslog service, which is responsible for handling system logs. After running the command, check if these files exist. If the issue persists, you can check the /etc/rsyslog.conf file to ensure the correct logging location is configured. You can also try using the commands sudo grep 'secure' /etc/rsyslog.conf or sudo grep 'auth.log' /etc/rsyslog.conf to search for the corresponding lines in the configuration file.
I hope this information helps you. If you have any other questions, feel free to ask me.
Q: Authentication refused: bad ownership or modes for directory /home/appuser#
A:
Hi there! This error usually indicates that there is a problem with the ownership or permissions of the /home/appuser directory. To resolve this issue, you can follow these steps:
Check directory permissions: Make sure the /home/appuser directory is owned by the correct user and has the correct access permissions. You can use the command ls -l /home to view the ownership and permissions of the directory.
Correct directory permissions: If the permissions for the /home/appuser directory are not correct, you can use the chmod command to modify them. For example, running sudo chmod 755 /home/appuser can set the directory permissions to rwxr-xr-x, ensuring that the owner has read, write, and execute permissions, and other users have read and execute permissions.
Correct directory ownership: If the owner of the /home/appuser directory is incorrect, you can use the chown command to change the owner. For example, running sudo chown appuser /home/appuser can change the owner of the directory to appuser.
Re-validate the identity: After correcting the directory permissions and ownership, you can try re-authenticating to ensure that the issue has been resolved.
I hope these steps help you resolve the issue! If you have any other questions, feel free to let me know.
Q: It's working now! You're amazing!#
A:
That's great to hear! I'm glad I could help you resolve the issue. If you have any other questions, feel free to ask.
Thank you for your kind words. I believe that with learning and practice, you can also become an expert in technology!
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