{"id":288183,"date":"2018-08-17T19:30:17","date_gmt":"2018-08-17T15:30:17","guid":{"rendered":"http:\/\/savepearlharbor.com\/?p=288183"},"modified":"-0001-11-30T00:00:00","modified_gmt":"-0001-11-29T21:00:00","slug":"","status":"publish","type":"post","link":"https:\/\/savepearlharbor.com\/?p=288183","title":{"rendered":"Linux in RAM: debirf way 2018"},"content":{"rendered":"\n
\n

Linux in RAM: debirf way<\/h1>\n

<\/p>\n

You want to have absolute disk speed? Let’s see how it can be done in 2018 with versioning and automation.<\/p>\n

<\/a> <\/p>\n

before run this tutorial<\/h2>\n

<\/p>\n

you must know<\/h3>\n

<\/p>\n

    \n
  • linux essential<\/li>\n
  • difference between bash<\/code> and sh<\/code> (debirf writen on sh<\/code>)<\/li>\n
  • how to format usb key (any way)<\/li>\n
  • what drivers you need for your hardware (or you can debug it via dmesg|lspci<\/code>)<\/li>\n
  • how to automate you desires via scripting<\/li>\n<\/ul>\n

    <\/p>\n

    you can replace:<\/h3>\n

    <\/p>\n

      \n
    • usb letter from \/dev\/sdb<\/code> to any else (\/dev\/sdd<\/code>)<\/li>\n
    • working directory from \/root\/Projects\/debirf\/<\/code> to your choice (\/home\/username\/Documents\/debirf<\/code>)<\/li>\n
    • mountpoint from \/media\/root\/8B46-1189<\/code> to \/media\/username\/myflashdrive<\/code><\/li>\n<\/ul>\n

      <\/p>\n

      Steps to prepare<\/h2>\n

      <\/p>\n

      (optional) enable non-free components for basic installation<\/h3>\n

      <\/p>\n

      I think, you will need the non-free repository.<\/p>\n

      <\/p>\n

        \n
      • open line number 107 of file \/usr\/bin\/debirf<\/code> like nano +107 $(which debirf)<\/code><\/li>\n
      • find function create_debootstrap<\/code><\/li>\n
      • find line like local OPTS="<\/code><\/li>\n
      • add --components main,contrib,non-free<\/code> in brackets<\/li>\n<\/ul>\n

        <\/p>\n

        for start:<\/h3>\n

        <\/p>\n

        Let’s think, our flash drive:<\/p>\n

        <\/p>\n

          \n
        • must be fast. recommend to use 8+ class, or booting will take many of your time<\/li>\n
        • \/dev\/sdb<\/li>\n
        • formated<\/li>\n
        • mounted at \/media\/root\/8B46-1189<\/code>.<\/li>\n
        • our working directory \/root\/Projects\/debirf\/<\/code><\/li>\n<\/ul>\n

          <\/p>\n

          Install debirf<\/h3>\n

          <\/p>\n

          apt-get install -yq debirf mtools genisoimage<\/code><\/pre>\n
            <\/p>\n
            \n
          • mtools needed for create iso via debirf (not working, but needed)<\/li>\n
          • genisoimage needed for create real working iso (optional)<\/li>\n<\/ul>\n
              <\/p>\n
            Prepare debirf working directory<\/h3>\n
              <\/p>\n
            mkdir -p \/root\/Projects\/debirf tar xzf \/usr\/share\/doc\/debirf\/example-profiles\/rescue.tgz -C \/root\/Projects\/debirf cd \/root\/Projects\/debirf\/rescue<\/code><\/pre>\n
              <\/p>\n
            And configure \/root\/Projects\/debirf\/rescue\/debirf.conf<\/h3>\n
              <\/p>\n
            DEBIRF_LABEL="debirf-rescue" DEBIRF_SUITE=stretch DEBIRF_DISTRO=debian DEBIRF_MIRROR=http:\/\/ftp.ru.debian.org\/debian\/<\/code><\/pre>\n
              <\/p>\n
            Create LiR<\/h2>\n
              <\/p>\n
              \n
            • Run debirf make .<\/code> and go away. It need many time, at minimal 15 minutes on top hardware.<\/li>\n
            • Run debirf makeiso .<\/code> for create not working iso (needed for grub.cfg file)<\/li>\n<\/ul>\n
                <\/p>\n
              Install grub to flash drive and copy LiR on it<\/h3>\n
                <\/p>\n
              I recommend you use bios legacy boot and package grub-pc. Not tested with UEFI, but must work. Next lines will be do:<\/p>\n
                <\/p>\n
                \n
              • create mount point (on GUI-powered systems enabled auto-mount, not needed)<\/li>\n
              • mount usb key to mount point (on GUI-powered systems enabled auto-mount, not needed)<\/li>\n
              • install grub<\/li>\n
              • copy grub file<\/li>\n
              • copy initramfs (system)<\/li>\n
              • copy vmlinuz (kernel)<\/li>\n
              • unmount usb key<\/li>\n
              • remove mount point<\/li>\n<\/ul>\n
                  <\/p>\n
                mkdir -p \/media\/root\/8B46-1189 mount \/dev\/sdb1 \/media\/root\/8B46-1189 grub-install --boot-directory=\/media\/root\/8B46-1189\/boot \/dev\/sdb cp \/root\/Projects\/debirf\/rescue\/iso\/boot\/grub\/grub.cfg \/media\/root\/8B46-1189\/boot\/grub\/ cp \/root\/Projects\/debirf\/rescue\/*.cgz \/media\/root\/8B46-1189 cp \/root\/Projects\/debirf\/rescue\/vmlinuz-* \/media\/root\/8B46-1189 umount \/media\/root\/8B46-1189 rm -rf \/media\/root\/8B46-1189<\/code><\/pre>\n
                  <\/p>\n
                Create bootable iso (optional)<\/h3>\n
                  <\/p>\n
                  \n
                • download isolinux.bin<\/li>\n
                • create isolinux config file<\/li>\n
                • create iso<\/li>\n<\/ul>\n
                    <\/p>\n
                  mkdir -p rescue\/iso\/isolinux\/ wget -O rescue\/iso\/isolinux\/isolinux.bin 'http:\/\/mirror.yandex.ru\/centos\/7\/os\/x86_64\/isolinux\/isolinux.bin'  cat << EOF > rescue\/iso\/isolinux\/isolinux.cfg TIMEOUT 5 DEFAULT lir  LABEL lir   LINUX \/vmlinuz-4.9.0-7-amd64   INITRD \/debirf-rescue_stretch_4.9.0-7-amd64.cgz EOF  genisoimage -b isolinux\/isolinux.bin -c isolinux\/boot.cat -no-emul-boot -boot-load-size 4 -boot-info-table -l -input-charset default -V LiR -A "Linux in RAM" -o rescue\/rescue.iso rescue\/iso\/<\/code><\/pre>\n
                    <\/p>\n
                  Check result<\/h2>\n
                    <\/p>\n
                    \n
                  • Install QEMU hypervisor apt-get install -yq qemu<\/code><\/li>\n
                  • run qemu-system-x86_64 -enable-kvm -m 512 -hda \/dev\/sdb<\/code><\/li>\n
                  • if previous command fails, remove -enable-kvm<\/code><\/li>\n
                  • VM will be started, booted from usb key<\/li>\n
                  • you must see two menu items, difference in end: console and serial. Select first entry.<\/li>\n
                  • in ~minute you will see many lines. after it ends \u2014 press enter to see welcome message<\/li>\n
                  • login: root, no password<\/li>\n<\/ul>\n
                      <\/p>\n
                    Customize it: Create custom debirf module<\/h2>\n
                      <\/p>\n
                    Module \u2014 executable sh script for running during LiR creating<\/p>\n
                      <\/p>\n
                      \n
                    • create module file<\/li>\n
                    • The order of file names is important. In file network<\/code> the resolving file will be changed to the system-resolved, and you can not work with the network.<\/li>\n
                    • lines from 1 to 3 must be present, line 3 must present file name<\/li>\n
                    • if you want install package \u2014 use construction #DEBIRF_PACKAGE>+<\/code><\/li>\n
                    • if you want work with rootfs \u2014 use $DEBIRF_ROOT<\/code><\/li>\n
                    • if you want to run command in fakeroot \u2014 use debirf_exec<\/code><\/li>\n<\/ul>\n
                        <\/p>\n
                      Sample:<\/h3>\n
                        <\/p>\n
                      cat <<< EOF > rescue\/modules\/mi #!\/bin\/sh -e  # debirf module: mi # prepare to run on mi notebook # # This script were written by # Eduard Generalov <eduard@generalov.net> # # They are Copyright 2018, and published under the MIT,  #DEBIRF_PACKAGE>+firmware-iwlwifi #DEBIRF_PACKAGE>+firmware-misc-nonfree #DEBIRF_PACKAGE>+wpasupplicant  echo 'iwlwifi' >> $DEBIRF_ROOT\/etc\/modules  cat << EOF > $DEBIRF_ROOT\/etc\/wpa_supplicant\/wpa_supplicant-wlp1s0.conf ctrl_interface=\/run\/wpa_supplicant update_config=1 network={         ssid="WiFi_SSID"         psk="WIFIPASSWORD" } EOF  cat << EOF > $DEBIRF_ROOT\/etc\/systemd\/network\/wireless.network [Match] Name=wlp1s0 [Network] DHCP=ipv4 [DHCP] RouteMetric=20 EOF <\/code><\/pre>\n
                        <\/p>\n
                      and replace line with resolved<\/code> in file rescue\/modules\/network with debirf_exec systemctl enable wpa_supplicant@wlp1s0.service systemd-networkd.service systemd-resolved.service<\/code><\/p>\n
                        <\/p>\n
                      Bonus: lxc on LiR<\/h3>\n
                        <\/p>\n
                      module rescue\/modules\/lxc<\/p>\n
                        <\/p>\n
                      #!\/bin\/sh -e  # debirf module: lxc # prepare lxc # # This script were written by # Eduard Generalov <eduard@generalov.net> # # They are Copyright 2018, and published under the MIT,  #DEBIRF_PACKAGE>+lxc  mkdir -p $DEBIRF_ROOT\/root\/.ssh\/ ssh-keygen -b 2048 -t rsa -f $DEBIRF_ROOT\/root\/.ssh\/id_rsa -q -N "" cp $DEBIRF_ROOT\/root\/.ssh\/id_rsa $DEBIRF_ROOT\/root\/.ssh\/authorized_keys chmod 400 $DEBIRF_ROOT\/root\/.ssh\/authorized_keys  debirf_exec systemctl enable lxc-net  cat << EOF > $DEBIRF_ROOT\/etc\/lxc\/default.conf lxc.network.type = veth lxc.network.link = lxc lxc.network.name = eth0 lxc.network.flags = up lxc.network.hwaddr = 00:FF:AA:FF:xx:xx  lxc.mount.entry=\/var\/cache\/apt var\/cache\/apt none bind,rw 0 0 lxc.mount.entry = \/root\/.ssh\/ root\/.ssh none bind,create=dir 0 0 EOF  cat << EOF > $DEBIRF_ROOT\/etc\/default\/lxc-net  USE_LXC_BRIDGE="true" LXC_BRIDGE="lxc" LXC_ADDR="10.0.3.1" LXC_NETMASK="255.255.255.0" LXC_NETWORK="10.0.3.0\/24" LXC_DHCP_RANGE="10.0.3.2,10.0.3.254" LXC_DHCP_MAX="253" LXC_DHCP_CONFILE="" LXC_DOMAIN="lxc" EOF<\/code><\/pre>\n
                        <\/p>\n
                      \u041e\u0431\u0440\u0430\u0449\u0435\u043d\u0438\u0435 \u043c\u043e\u0434\u0435\u0440\u0430\u0442\u043e\u0440\u0430: \u043d\u0430\u043c \u0442\u0443\u0442 \u0432 \u041f\u0435\u0441\u043e\u0447\u043d\u0438\u0446\u0443 \u043f\u0440\u0438\u0448\u043b\u0430 \u0441\u0442\u0430\u0442\u044c\u044f \u043f\u043e\u043b\u043d\u043e\u0441\u0442\u044c\u044e \u043d\u0430 \u0430\u043d\u0433\u043b\u0438\u0439\u0441\u043a\u043e\u043c \u044f\u0437\u044b\u043a\u0435. \u041c\u044b \u0435\u0451 \u043f\u0440\u043e\u0447\u0438\u0442\u0430\u043b\u0438 \u0438 \u0440\u0435\u0448\u0438\u043b\u0438 \u0432\u044b\u043f\u0443\u0441\u0442\u0438\u0442\u044c \u0440\u0430\u0434\u0438 \u043e\u0447\u0435\u0440\u0435\u0434\u043d\u043e\u0433\u043e \u043f\u044f\u0442\u043d\u0438\u0447\u043d\u043e\u0433\u043e \u044d\u043a\u0441\u043f\u0435\u0440\u0438\u043c\u0435\u043d\u0442\u0430. \u041d\u0435 \u0441\u0443\u0434\u0438\u0442\u0435 \u0441\u0442\u0440\u043e\u0433\u043e, \u0432\u0441\u0435\u043c peace and happy Friday! Let’s come together! \u041a\u043e\u0440\u043e\u0447\u0435, \u0444\u0440\u043e\u043c \u0437\u0435 \u0431\u043e\u0442\u0442\u043e\u043c \u043e\u0444 \u0430\u0443\u0430 \u0445\u0430\u0440\u0442\u0441.<\/p><\/blockquote>\n<\/div>\n