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RHCSA

About this Course

This course covers everything you need to know in order to pass the Red Hat Certified Systems Administrator (RHCSA) exam for RHEL 7. Becoming RHCSA certified proves that you have developed a strong proficiency in RHEL. RHEL is short for “RedHat Enterprise Linux” and as the name suggests, it’s a […]

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Setting up an LDAP client

Overview There are 2 main server-side ldap software you can use to set up an ldap server: OpenLDAP Microsoft Active Directory (AD) Unfortunately we don’t have a single client-side ldap software that can connect to both of these types of LDAP servers. Instead we have the following 2 options: openldap-clients: […]

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SELinux Summary

The policy book can be thought of as a really big text book, which contains 3 chapters. Chapter 1 – Contains a list of all available security attributes. There are actually 4 lists, one for each type of the differnt types of suecurity attributes user:role:type:level. In the targeted policy, the […]

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The ACL’s mask setting

Overview By the end of this article you should be able to answer the following questions: In the previous example we had: $ getfacl /tmp/testfile.txt getfacl: Removing leading ‘/’ from absolute path names # file: tmp/testfile.txt # owner: root # group: root user::rw- user:homer:rw- group::r– mask::rw- other::r– Here we have […]

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Applying ACLs to directories

Overview By the end of this article you should be able to answer the following questions: Using ACL on directories So far we have seen how to give a user/group special permissions for a particular file. However you can also give a user/group special permissions to a folder. This is […]

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The systemd emergency.target

Overview By the end of this article you should be able to answer the following questions: If you have problems booting up your machine, then you can boot into the emergency.target. In this target you can explore your filesystem for possible issues. In this filesystem, the root filesystem (/) has […]

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Job Scheduling

There will be times when you will want to schedule some task to automatically occur in the future. There are 2 possible scenrario. Scenario 1 – In the first scenario you might want to run tasks periodically, e.g. once a month. In which case the best way to achieve is […]

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