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redhat free cost Developer subscription

Create a new login in  https://developers.redhat.com An email will be send from redhat for the activation to the email ID with which the new login is created. Once confirmed by clicking the link, login to  https://developers.redhat.com to verify the correct login. Afterwards login to   https://access.redhat.com/  to verify the active subscription . Then login to the Newly installed redhat server via ssh and execute the following commands sudo subscription-manager register when username and password is asked, provide the login credentials created previously. after that if an error comes like this: ================= HTTP error (401 - Unauthorized): You must first accept Red Hat's Terms and conditions.  Please visit https://www.redhat.com/wapps/tnc/ackrequired?site=candlepin&event=signOn . You may have to log out of and back into the  Customer Portal in order to see the terms. ================= login to the link provided and accept the terms and
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CDbConnection failed to open the DB connection mysql 8

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While accessing web configured with mysql 8 and php and you see the following error: CDbConnection failed to open the DB connection: SQLSTATE[HY000] [2054] The server requested authentication method unknown to the client OR  PHP Fatal error:  Uncaught PDOException: PDO::__construct(): The server requested authentication method unknown to the client [caching_sha2_password]  It maybe due to  PHP devs might have not implemented the MySQL's 8.0 connection protocol ( auth with caching_sha2_password ) within the newer PHP versions. If you want to use mysql >= 8 and you dont care about caching_sha2_password,  If you are running a fresh install of mysql 8, just select the second option as shown in the image. Otherwise, you need to  configure MySQL 8.0 to run in mysql_native_password mode. As it can't configured in my.cnf, change the user profile as:- ALTER USER 'mysqlUsername'@'localhost' IDENTIFIED WITH mysql_native_password BY 'mysqlUse
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Win 10 Modifying the Automatic Installation of Updates

 Open the Run command (Win + R), in it type: gpedit.msc and press enter Navigate to: Computer Configuration -> Administrative Templates -> Windows Components -> Windows Update Open it and change the Configure Automatic Updates setting to ‘2 - Notify for download and notify for install’ Open the Settings app (Win + I) and navigate to -> Update and Security -> Windows Updates. Click ‘Check for updates’ which applies the new configuration setting. Restart system
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How to delete 'n' number if commands executed from bash history

For deleting 'n' number of commands frm bash history, first type history command in shell, #history for example if you need to delete commands from line 520 to line 637 . execute the command as follows. #for h in $(seq 520 637 | tac); do history -d $h; done thats it.
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Permission denied: user=root, access=WRITE, inode="/user/root":hdfs:hdfs:drwxr-xr-x

If you are running the hive command as root and still recieve the same error, do the following root@hadoop_server:~# sudo -u hdfs hadoop fs -mkdir /user/root root@hadoop_server:~# sudo -u hdfs hadoop fs -chown root:root /user/root this should fix the problem and you will be able to run the hive command line.
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IM002][unixODBC][Driver Manager]Data source name not found, and no default driver specified [ISQL]ERROR: Could not SQLConnect

If  trying isql from server gives the following error, IM002][unixODBC][Driver Manager]Data source name not found, and no default driver specified [ISQL]ERROR: Could not SQLConnect Then check the results of following commands in servers odbcinst -q -s odbcinst -q -d if you find any error means that the server is unable to read both odbc.ini and odbcinst.ini files. To resolve this configure the environment variable of server as  export ODBCSYSINI=/etc/ export ODBCINI=/etc/odbc.ini this should fix the error.
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How to add an environment variable permanent in Redhat Linux

You can add an environment variable using the export command. But you can see that once you logout, the parameters you added wont be there. So inorder to add those variables permanently after adding the variable using export command, for example [root@server ~]# export LD_LIBRARY_PATH=/usr/lib/oracle/12.1/client64/lib:/usr/lib:/usr/lib64:  we need to add the same command line in the file /etc/profile or /etc/bashrc  so that it will make the variable permanent for all users. If the change is neeed only for the current user annd the command in the .bashrc file inside the home folder of the current user.
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