Post related to linux OS
How can we check the passphrase of a private key?
Is it possible to do that using the following command:
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ssh-keygen -y |
To use multiple shh private keys on a client you need to create the file config inside the folder .ssh and use the following entries:
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Host myshortname realname.example.com HostName realname.example.com IdentityFile ~/.ssh/realname_rsa User remoteusername Host myother realname2.example.org HostName realname2.example.org IdentityFile ~/.ssh/realname2_rsa User remoteusername |
where IdentityFile is the private key for realname.
When you try to connect to a remote server via ssh and you receive the message:
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@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY! Someone could be eavesdropping on you right now (man-in-the-middle attack)! It is also possible that a host key has just been changed. The fingerprint for the RSA key sent by the remote host is SHA256:shacode. Please contact your system administrator. Add correct host key in /Users/username/.ssh/known_hosts to get rid of this message. Offending RSA key in /Users/username/.ssh/known_hosts:21 RSA host key for IP_ADDRESS has changed and you have requested strict checking. Host key verification failed. |
you can reset the known_host for the ip_address with the command:
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ssh-keygen -R <hostname or ip_address> |
the -R hostname Removes all keys belonging to hostname from a known_hosts file.
If you have wordpress in a local machine and you want update the wordpress version without enable ftp you can add to the wordpress config file wp-config.php this setting:
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define('FS_METHOD', 'direct'); |
remember you need to have permission to write in the wordpress folder. If you have a LAMP server make sure you have the user set to www-data.
If you receive the following error during sass installation:
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ERROR: While executing gem ... (Gem::FilePermissionError) You don't have write permissions for the /usr/bin directory. |
try to use this command:
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sudo gem install sass -n /usr/local/bin |
If Mamp is configured with virtual hosts set in wp-config.php the DB_HOST like the following:
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/** MySQL hostname */ define('DB_HOST', 'localhost:3306'); |
Install apache2:
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sudo apt-get install apache2 |
Set Global ServerName to Suppress Syntax Warnings. Append in /etc/apache2/apache2.conf (bottom of the file):
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ServerName IP_ADDRESS |
Launch the command:
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sudo apache2ctl configtest |
you should receive the message Syntax OK.
Restart Apache to implement the changes:
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sudo /etc/init.d/apache2 restart |
Adjust the Firewall to Allow Web Traffic
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sudo ufw app list |
http://your_server_IP_address to see the welcome page from apache.
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sudo apt-get install mysql-server |
Set a secure password for the root user and launch the script to remove some dangerous defaults and lock down access to our database system
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sudo service mysql restart //restart the service mysql_secure_installation |
try the connection to the db with:
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mysql -u root -p |
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sudo apt-get install php libapache2-mod-php php-mcrypt php-mysql |
Modify the way that Apache serves files when a directory is requested serving php file before instead of html edit the file:
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/etc/apache2/mods-enabled/dir.conf |
And insert the php index file before:
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<IfModule mod_dir.c> DirectoryIndex index.php index.html index.cgi index.pl index.xhtml index.htm </IfModule> |
restart apache: sudo /etc/init.d/apache2 restart
test php with a phpinfo page.
Resources:
Change the root password:
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passwd root |
to know the ip address we need to launch the command ifconfig but is not installed by default.
Install networks tool:
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apt-get update apt-get install net-tools apt-get install openssh-server apt-get install ufw |
To allow connection from terminal enable ssh launch the command:
Install also:
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apt-get install sudo apt-get install vim apt-get install software-properties-common |
sudo service ssh restart
The webserver (Apache) runs as user www-data and group www-data by default on Ubuntu so you need to give the permission to the file/folder are not owned by this user.
To make www-data the owner which makes it writeable:
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chgrp www-data /var/www/html/wp-content/uploads chmod g+w /var/www/html/wp-content/uploads |
After the system updates if you still have:
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n packages can be updated. n updates are security updates. |
Use the following commands to install all the packages
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sudo apt-get dist-upgrade sudo apt-get update sudo apt-get upgrade |