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    Simple Linux Swap File Creation

    Scheduled Pinned Locked Moved IT Discussion
    linuxswapswapfilememory
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    • scottalanmillerS
      scottalanmiller @Lakshmana
      last edited by

      @lakshmana Should work on any Linux.

      1 Reply Last reply Reply Quote 0
      • black3dynamiteB
        black3dynamite @scottalanmiller
        last edited by

        @scottalanmiller said in Simple Linux Swap File Creation:

        A simple process for making a swapfile to add swap space to a Linux instance.

        sudo fallocate -l 2G /swapfile
        sudo chmod 600 /swapfile
        sudo mkswap /swapfile
        sudo swapon /swapfile
        sudo echo "/swapfile swap swap defaults 0 0">>/etc/fstab
        

        Or to copypasta as a single line:

        fallocate -l 2G /swapfile && chmod 600 /swapfile && mkswap /swapfile && swapon /swapfile  && echo "/swapfile swap swap defaults 0 0">>/etc/fstab
        

        sudo swapon /swapfile wasn't working for me. In /var/log/messages, I was getting these messages.
        0_1533087006259_6ac4c960-792b-46e4-bd30-3f7bc8b697c2-image.png

        This works for me:

        sudo dd if=/dev/zero of=/swapfile count=2048 bs=1MiB
        sudo chmod 600 /swapfile
        sudo mkswap /swapfile
        sudo swapon /swapfile
        sudo echo "/swapfile swap swap defaults 0 0">>/etc/fstab
        
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        • jmooreJ
          jmoore @scottalanmiller
          last edited by

          @scottalanmiller I think I did something similar a few months back to increase performance. Not sure it did much but I guess it hasn't hurt

          scottalanmillerS 1 Reply Last reply Reply Quote 0
          • scottalanmillerS
            scottalanmiller @jmoore
            last edited by

            @jmoore said in Simple Linux Swap File Creation:

            @scottalanmiller I think I did something similar a few months back to increase performance. Not sure it did much but I guess it hasn't hurt

            It reduces performance, but increases capacity.

            dafyreD jmooreJ 2 Replies Last reply Reply Quote 1
            • dafyreD
              dafyre @scottalanmiller
              last edited by

              @scottalanmiller said in Simple Linux Swap File Creation:

              @jmoore said in Simple Linux Swap File Creation:

              @scottalanmiller I think I did something similar a few months back to increase performance. Not sure it did much but I guess it hasn't hurt

              It reduces performance, but increases capacity.

              Does using a swapfile vs a swap partition reduce performance to the point it is significantly noticeable?

              scottalanmillerS 1 Reply Last reply Reply Quote 0
              • scottalanmillerS
                scottalanmiller @dafyre
                last edited by

                @dafyre said in Simple Linux Swap File Creation:

                @scottalanmiller said in Simple Linux Swap File Creation:

                @jmoore said in Simple Linux Swap File Creation:

                @scottalanmiller I think I did something similar a few months back to increase performance. Not sure it did much but I guess it hasn't hurt

                It reduces performance, but increases capacity.

                Does using a swapfile vs a swap partition reduce performance to the point it is significantly noticeable?

                No, that's why it's done now. Swap should be used SO little, and flexibility trumps the tiny performance increase.

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                • jmooreJ
                  jmoore @scottalanmiller
                  last edited by

                  @scottalanmiller Well that explains it lol. It was a long time ago now so don't remember what my logic was, or if there was any at all

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                  • JaredBuschJ
                    JaredBusch
                    last edited by

                    Just manually installed CentOS 8 for the first time on my local system to test something, and they still use a swap partition by default.

                    Warns you if you delete it.

                    d695d123-0afc-48a5-9a19-cdb145a7de05-image.png

                    black3dynamiteB 1 Reply Last reply Reply Quote 0
                    • black3dynamiteB
                      black3dynamite @JaredBusch
                      last edited by

                      @JaredBusch said in Simple Linux Swap File Creation:

                      Just manually installed CentOS 8 for the first time on my local system to test something, and they still use a swap partition by default.

                      Warns you if you delete it.

                      d695d123-0afc-48a5-9a19-cdb145a7de05-image.png

                      I automatically ignore Fedora and CentOS warning about that.

                      black3dynamiteB JaredBuschJ 2 Replies Last reply Reply Quote 0
                      • black3dynamiteB
                        black3dynamite @black3dynamite
                        last edited by

                        @black3dynamite said in Simple Linux Swap File Creation:

                        @JaredBusch said in Simple Linux Swap File Creation:

                        Just manually installed CentOS 8 for the first time on my local system to test something, and they still use a swap partition by default.

                        Warns you if you delete it.

                        d695d123-0afc-48a5-9a19-cdb145a7de05-image.png

                        I ignore Fedora and CentOS warning about that.

                        1 Reply Last reply Reply Quote 0
                        • JaredBuschJ
                          JaredBusch @black3dynamite
                          last edited by

                          @black3dynamite said in Simple Linux Swap File Creation:

                          I automatically ignore Fedora and CentOS warning about that.

                          I ignored it also. just pointing out the default behavior.

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