RHEL7 - Network Manager

gratchiegratchie Junior MemberMember Posts: 7 ■□□□□□□□□□
in LPI, Red Hat & Linux Foundation
Do I have to keep Network Manager enabled on my labs? Unless I'm missing something, everything works as it is with Network Manager disabled. I'm comfortable editing network-scripts by hand and don't need nm-gui stuff. I'd like to know if Network Manager is required for rhcsa/rhce. thanks!
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  • ExpectExpect Senior Member Member Posts: 252 ■■■■□□□□□□
    you don't have to use it.
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  • varelgvarelg Objectives my friend! Banned Posts: 790
    gratchie wrote: »
    Do I have to keep Network Manager enabled on my labs? Unless I'm missing something, everything works as it is with Network Manager disabled. I'm comfortable editing network-scripts by hand and don't need nm-gui stuff. I'd like to know if Network Manager is required for rhcsa/rhce. thanks!
    You are actually on the right track. Know the syntax of key files. Or start liking nmtui.
    nmcli is absolutely not a requirement for RHCSA and RHCE. They better not make it into one. Its long-winded syntax, sometimes you'd type less if you go and manually redact a config file than to do the same thing via nmcli.
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  • gratchiegratchie Junior Member Member Posts: 7 ■□□□□□□□□□
    Perfect. Systemctl disable NetworkManager it is. Thanks!
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  • VeritiesVerities Senior Member Member Posts: 1,162
    Yeah you don't have to use network manager they just added it so you don't have to manually update all the config files. If you want to edit all the files manually that's OK too.
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  • varelgvarelg Objectives my friend! Banned Posts: 790
    I just read a little note at Cert depot, and have not personally tested it, but if you disable Network Manager, you'll have to use iptables for your firewall. firewall-cmd won't work if Network Manager is off.
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  • JockVSJockJockVSJock Censorship is Un-American Member Posts: 1,118
    varelg wrote: »
    I just read a little note at Cert depot, and have not personally tested it, but if you disable Network Manager, you'll have to use iptables for your firewall. firewall-cmd won't work if Network Manager is off.

    Really? I looked and couldn't find any info on this.
    ***Freedom of Speech, Just Watch What You Say*** Example, Beware of CompTIA Certs (Deleted From Google Cached)

    "Its easier to deceive the masses then to convince the masses that they have been deceived."
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  • VeritiesVerities Senior Member Member Posts: 1,162
    Here's what I could find from the official Red Hat documentation:

    https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/Security_Guide/sec-Using_Firewalls.html

    Firewalld uses Network Manager to update zones. If you have any experience with firewalld, you should realize zones are a huge piece of it. It only makes sense if you disable Network Manager you would have to use IP Tables then.

    Firewalld is just a front-end application for netfilter, the part of the kernel that actually handles packet filtering. So if you disabled network manager,you would only be able to use the other tool that provides instructions to netfilter, which would be IP tables and in my opinion firewalld is hands down easier to use than IP tables.

    I don't recommend disabling network manager because you don't like nmcli. If you really don't want to use the CLI, either install the GUI tool or TUI tool.
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  • gratchiegratchie Junior Member Member Posts: 7 ■□□□□□□□□□
    hmmm, I may have to play with this a little bit more then. I was looking forward to using firewall-cmd instead of iptables. thanks for the input folks!
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  • UndyUndy Member Member Posts: 37 ■■□□□□□□□□
    You could still edit the configuration files and use NetworkManager.

    For instance, create a new file /etc/sysconfig/network-scripts/ifcfg-TEST
    Add- TYPE, BOOTPROTO, ONBOOT, NAME, UUID, DEVICE, IPADDR, PREFIX, GATEWAY, etc....

    Then

    systemctl restart NetworkManager

    "nmcli con show" should show the new connection.

    If you edit an existing file, make sure to do a "nmcli con reload" which will pull in all the new settings.
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