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    Simple Linux Swap File Creation

    IT Discussion
    linux swap swapfile memory
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    • LakshmanaL
      Lakshmana @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
      

      This can be done in Noobs OS for raspberry tooo?

      scottalanmillerS 1 Reply Last reply Reply Quote 0
      • 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
          
          1 Reply Last reply Reply Quote 0
          • 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.

                  1 Reply Last reply Reply Quote 0
                  • 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

                    1 Reply Last reply Reply Quote 0
                    • 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.

                            1 Reply Last reply Reply Quote 0
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