Install Docker on Termux

answerfile

KEYMAPOPTS="us us"
HOSTNAMEOPTS="-n alpine"
INTERFACESOPTS="auto lo
iface lo inet loopback

auto eth0
iface eth0 inet dhcp
    hostname alpine
"
TIMEZONEOPTS="-z UTC"
PROXYOPTS="none"
APKREPOSOPTS="http://dl-cdn.alpinelinux.org/alpine/v3.19/main http://dl-cdn.alpinelinux.org/alpine/v3.19/community"
SSHDOPTS="-c openssh"
NTPOPTS="-c busybox"
DISKOPTS="-v -m sys -s 0 /dev/sda"

docker-termux.md

Docker on Termux [in a VM] using proot-distro with Arch Linux

Warn: for Termux only, check the original gist, some paths are different.

Automatic script + using docker on CLI from outside of Alpine VM https://github.com/AntonyZ89/docker-qemu-arm

Create a Linux VM and install Docker in it so you can (slowly) run x86 Docker containers on your Android device.

Recommended to use SSH or external keyboard to execute the following commands unless you want sore thumbs. See https://wiki.termux.com/wiki/Remote_Access#SSH

• Install QEMU

   pkg install qemu-utils qemu-common qemu-system-x86_64-headless
  

• Download Alpine Linux 3.19 (virt optimized) ISO

   mkdir alpine && cd $_
   wget http://dl-cdn.alpinelinux.org/alpine/v3.19/releases/x86_64/alpine-virt-3.19.0-x86_64.iso
  

• Create disk (note it won't actually take 4GB of space, more like 500MB)

   qemu-img create -f qcow2 alpine.img 4G
  

• Boot it up

  qemu-system-x86_64 -machine q35 -m 1024 -smp cpus=2 -cpu qemu64 \
    -drive if=pflash,format=raw,read-only,file=/data/data/com.termux/files/usr/share/qemu/edk2-x86_64-code.fd \
    -netdev user,id=n1,hostfwd=tcp::2222-:22 -device virtio-net,netdev=n1 \
    -cdrom alpine-virt-3.19.0-x86_64.iso \
    -nographic alpine.img
  

• Login with user root (no password)

• Setup network (press Enter to use defaults):

   localhost:~# setup-interfaces
   Available interfaces are: eth0.
   Enter '?' for help on bridges, bonding and vlans.
   Which one do you want to initialize? (or '?' or 'done') [eth0] 
   Ip address for eth0? (or 'dhcp', 'none', '?') [dhcp] 
   Do you want to do any manual network configuration? [no] 
   localhost:~# ifup eth0
  

• Create an answerfile to speed up installation:

  localhost:~# wget https://gist.githubusercontent.com/AntonyZ89/cd64610ef49f9fbb6c8f8acff709483e/raw/answerfile
  

• Patch setup-disk to enable serial console output on boot

  localhost:~# sed -i -E 's/(local kernel_opts)=.*/\1="console=ttyS0"/' /sbin/setup-disk
  

• Run setup to install to disk

  localhost:~# setup-alpine -f answerfile
  

  • choose a password to root [opcional]
  • create a user
  • choose a password to your user [opcional]
  • erase the disk pressing Y

• Once installation is complete, power off the VM (command poweroff) and boot again without cdrom:

  qemu-system-x86_64 -machine q35 -m 1024 -smp cpus=2 -cpu qemu64 \
    -drive if=pflash,format=raw,read-only,file=/data/data/com.termux/files//share/qemu/edk2-x86_64-code.fd \
    -netdev user,id=n1,hostfwd=tcp::2222-:22 -device virtio-net,netdev=n1 \
    -nographic alpine.img
  

• Install docker and enable on boot:

  alpine:~# apk update && apk add docker docker-cli-compose
  alpine:~# service docker start
  alpine:~# rc-update add docker
  

• Useful keys:

  • Ctrl+a x: quit emulation
  • Ctrl+a h: toggle QEMU console

Errors:

qemu-system-x86_64: alpine.img: Failed to get "write" lock
Is another process using the image [alpine.img]?

solution: kill qemu process

$ lsof | grep alpine.img

qemu-syst 30129 30130 qemu-syst u0_a322  12u      REG 254,58 3928817664   159434 /home/antonydev/alpine/alpine.img
qemu-syst 30129 30131 qemu-syst u0_a322  12u      REG 254,58 3928817664   159434 /home/antonydev/alpine/alpine.img
qemu-syst 30129 30133 qemu-syst u0_a322  12u      REG 254,58 3928817664   159434 /home/antonydev/alpine/alpine.img

$ kill -9 30129