- Table Of Contents
- General
- Prerequisites
- On 1st Console
- On 2nd Console
- Running Firecracker By Single Command
- Useful Resources
Please follow Getting Started with Firecracker for more details.
Preliminary three Firecracker-v0.23.2-x86_64.tgz, hello-vmlinux.bin, hello-rootfs.ext4 files were downloaded, and Firecracker-v0.23.2-x86_64.tgz was unpacked.
Note: two consoles will be used at the beginning - so, follow On 2nd Console section for second console session after running firecracker on the first one.
➜ firecracker pwd && ls -la
/home/vit/prjs/firecracker
total 54968
drwxrwxr-x 2 vit vit 4096 Jan 28 22:49 .
drwxr-xr-x 15 vit vit 4096 Jan 28 22:45 ..
lrwxrwxrwx 1 vit vit 26 Jan 28 22:47 firecracker -> firecracker-v0.23.2-x86_64
-rw-rw-r-- 1 vit vit 26507 Jan 15 18:52 firecracker_spec-v0.23.2.yaml
-rwxr-xr-x 1 vit vit 2046336 Jan 15 18:52 firecracker-v0.23.2-x86_64
-rw-rw-r-- 1 vit vit 31457280 Jan 28 22:49 hello-rootfs.ext4
-rw-rw-r-- 1 vit vit 21266136 Jan 28 22:48 hello-vmlinux.bin
lrwxrwxrwx 1 vit vit 21 Jan 28 22:47 jailer -> jailer-v0.23.2-x86_64
-rwxr-xr-x 1 vit vit 1457312 Jan 15 18:52 jailer-v0.23.2-x86_64
-rw-rw-r-- 1 vit vit 11358 Jan 15 18:52 LICENSE
-rw-rw-r-- 1 vit vit 89 Jan 15 18:52 NOTICE
-rw-rw-r-- 1 vit vit 1562 Jan 15 18:52 THIRD-PARTY
➜ firecracker # after running the next command just continue from 2nd tty
➜ firecracker ./firecracker --api-sock /tmp/firecracker.socket
[ 0.000000] Linux version 4.14.55-84.37.amzn2.x86_64 (mockbuild@ip-10-0-1-79) (gcc version 7.3.1 20180303 (Red Hat 7.3.1-5) (GCC)) #1 SMP Wed Jul 25 18:47:15 UTC 2018
[ 0.000000] Command line: console=ttyS0 reboot=k panic=1 pci=off root=/dev/vda rw virtio_mmio.device=4K@0xd0000000:5
~...~
[ 0.116064] VFS: Mounted root (ext4 filesystem) on device 254:0.
[ 0.117313] devtmpfs: mounted
[ 0.118587] Freeing unused kernel memory: 1268K
[ 0.124111] Write protecting the kernel read-only data: 12288k
[ 0.126557] Freeing unused kernel memory: 2016K
[ 0.128780] Freeing unused kernel memory: 584K
OpenRC init version 0.35.5.87b1ff59c1 starting
Starting sysinit runlevel
OpenRC 0.35.5.87b1ff59c1 is starting up Linux 4.14.55-84.37.amzn2.x86_64 (x86_64)
* Mounting /proc ...
[ ok ]
* Mounting /run ...
* /run/openrc: creating directory
* /run/lock: creating directory
* /run/lock: correcting owner
* Caching service dependencies ...
Service `hwdrivers' needs non existent service `dev'
[ ok ]
Starting boot runlevel
* Remounting devtmpfs on /dev ...
[ ok ]
* Mounting /dev/mqueue ...
[ ok ]
* Mounting /dev/pts ...
[ ok ]
* Mounting /dev/shm ...
[ ok ]
* Setting hostname ...
[ ok ]
* Checking local filesystems ...
[ ok ]
* Remounting filesystems ...
[ ok[ 0.307292] random: fast init done
]
* Mounting local filesystems ...
[ ok ]
* Loading modules ...
modprobe: can't change directory to '/lib/modules': No such file or directory
modprobe: can't change directory to '/lib/modules': No such file or directory
[ ok ]
* Mounting misc binary format filesystem ...
[ ok ]
* Mounting /sys ...
[ ok ]
* Mounting security filesystem ...
[ ok ]
* Mounting debug filesystem ...
[ ok ]
* Mounting SELinux filesystem ...
[ ok ]
* Mounting persistent storage (pstore) filesystem ...
[ ok ]
Starting default runlevel
[ 1.056069] clocksource: tsc: mask: 0xffffffffffffffff max_cycles: 0x211399552f8, max_idle_ns: 440795292447 ns
Welcome to Alpine Linux 3.8
Kernel 4.14.55-84.37.amzn2.x86_64 on an x86_64 (ttyS0)
localhost login: root
Password: <- root
Welcome to Alpine!
The Alpine Wiki contains a large amount of how-to guides and general
information about administrating Alpine systems.
See <http://wiki.alpinelinux.org>.
You can setup the system with the command: setup-alpine
You may change this message by editing /etc/motd.
login[855]: root login on 'ttyS0'
localhost:~# uname -a && ps -fe && df -h
Linux localhost 4.14.55-84.37.amzn2.x86_64 #1 SMP Wed Jul 25 18:47:15 UTC 2018 x86_64 Linux
PID USER TIME COMMAND
1 root 0:00 {openrc-init} /sbin/init
2 root 0:00 [kthreadd]
3 root 0:00 [kworker/0:0]
4 root 0:00 [kworker/0:0H]
5 root 0:00 [kworker/u2:0]
6 root 0:00 [mm_percpu_wq]
7 root 0:00 [ksoftirqd/0]
8 root 0:00 [rcu_sched]
9 root 0:00 [rcu_bh]
10 root 0:00 [migration/0]
11 root 0:00 [cpuhp/0]
12 root 0:00 [kdevtmpfs]
13 root 0:00 [netns]
14 root 0:00 [kworker/u2:1]
15 root 0:00 [oom_reaper]
132 root 0:00 [kworker/0:1]
133 root 0:00 [writeback]
134 root 0:00 [kcompactd0]
136 root 0:00 [ksmd]
137 root 0:00 [crypto]
138 root 0:00 [kintegrityd]
140 root 0:00 [kblockd]
247 root 0:00 [kauditd]
252 root 0:00 [kswapd0]
385 root 0:00 [kthrotld]
431 root 0:00 [ipv6_addrconf]
440 root 0:00 [kstrp]
455 root 0:00 [kworker/0:1H]
456 root 0:00 [jbd2/vda-8]
457 root 0:00 [ext4-rsv-conver]
846 root 0:00 supervise-daemon agetty.ttyS0 --start --pidfile /run/agett
848 root 0:00 /bin/login -- root
854 root 0:00 [kworker/u2:2]
855 root 0:00 -ash
857 root 0:00 ps -fe
Filesystem Size Used Available Use% Mounted on
/dev/root 28.0M 21.0M 4.9M 81% /
devtmpfs 10.0M 0 10.0M 0% /dev
tmpfs 11.2M 80.0K 11.1M 1% /run
shm 56.1M 0 56.1M 0% /dev/shm
localhost:~# ls -la /
total 31
drwxr-xr-x 19 root root 1024 Jan 28 21:03 .
drwxr-xr-x 19 root root 1024 Jan 28 21:03 ..
drwxr-xr-x 2 root root 3072 Oct 19 2018 bin
drwxr-xr-x 7 root root 2120 Jan 28 21:03 dev
drwxr-xr-x 22 root root 1024 Oct 19 2018 etc
drwxr-xr-x 2 root root 1024 Sep 11 2018 home
drwxr-xr-x 6 root root 1024 Oct 19 2018 lib
drwx------ 2 root root 12288 Oct 18 2018 lost+found
drwxr-xr-x 5 root root 1024 Sep 11 2018 media
drwxr-xr-x 2 root root 1024 Sep 11 2018 mnt
dr-xr-xr-x 43 root root 0 Jan 28 21:03 proc
drwx------ 3 root root 1024 Oct 19 2018 root
drwxr-xr-x 5 root root 140 Jan 28 21:03 run
drwxr-xr-x 2 root root 4096 Oct 19 2018 sbin
drwxr-xr-x 2 root root 1024 Sep 11 2018 srv
dr-xr-xr-x 12 root root 0 Jan 28 21:03 sys
drwxrwxrwt 2 root root 1024 Sep 11 2018 tmp
drwxr-xr-x 9 root root 1024 Oct 19 2018 usr
drwxr-xr-x 11 root root 1024 Oct 19 2018 var
localhost:~# cat /etc/os-release
NAME="Alpine Linux"
ID=alpine
VERSION_ID=3.8.1
PRETTY_NAME="Alpine Linux v3.8"
HOME_URL="http://alpinelinux.org"
BUG_REPORT_URL="http://bugs.alpinelinux.org"
localhost:~# reboot
PID1: Received "reboot" from FIFO...
localhost:~# Starting reboot runlevel
* Unmounting loop devices
* Unmounting filesystems
Sending the final term signal
Sending the final kill signal
[ 755.990303] Unregister pv shared memory for cpu 0
[ 755.991998] reboot: Restarting system
[ 755.993229] reboot: machine restart
➜ firecracker # we are back to my OS
➜ firecracker kernel_path=$(pwd)"/hello-vmlinux.bin" && curl --unix-socket /tmp/firecracker.socket -i \
-X PUT 'http://localhost/boot-source' \
-H 'Accept: application/json' \
-H 'Content-Type: application/json' \
-d "{
\"kernel_image_path\": \"${kernel_path}\",
\"boot_args\": \"console=ttyS0 reboot=k panic=1 pci=off\"
}"
HTTP/1.1 204
Server: Firecracker API
Connection: keep-alive
➜ firecracker rootfs_path=$(pwd)"/hello-rootfs.ext4"
curl --unix-socket /tmp/firecracker.socket -i \
-X PUT 'http://localhost/drives/rootfs' \
-H 'Accept: application/json' \
-H 'Content-Type: application/json' \
-d "{
\"drive_id\": \"rootfs\",
\"path_on_host\": \"${rootfs_path}\",
\"is_root_device\": true,
\"is_read_only\": false
}"
HTTP/1.1 204
Server: Firecracker API
Connection: keep-alive
➜ firecracker curl --unix-socket /tmp/firecracker.socket -i \
-X PUT 'http://localhost/actions' \
-H 'Accept: application/json' \
-H 'Content-Type: application/json' \
-d '{
"action_type": "InstanceStart"
}'
HTTP/1.1 204
Server: Firecracker API
Connection: keep-alive
➜ firecracker # now I can login from first tty
➜ firecracker [ -r /dev/kvm ] && [ -w /dev/kvm ] && echo "OK" || echo "FAIL"
OK
➜ firecracker
➜ firecracker cat vm_config.json
{
"boot-source": {
"kernel_image_path": "hello-vmlinux.bin",
"boot_args": "console=ttyS0 reboot=k panic=1 pci=off"
},
"drives": [
{
"drive_id": "rootfs",
"path_on_host": "hello-rootfs.ext4",
"is_root_device": true,
"is_read_only": false
}
],
"machine-config": {
"vcpu_count": 2,
"mem_size_mib": 1024,
"ht_enabled": false
}
}
➜ firecracker ls -la /tmp/firecracker.socket
srwxrwxr-x 1 vit vit 0 Jan 28 22:49 /tmp/firecracker.socket
➜ firecracker rm -f /tmp/firecracker.socket
➜ firecracker ./firecracker --api-sock /tmp/firecracker.socket --config-file vm_config.json
[ 0.000000] Linux version 4.14.55-84.37.amzn2.x86_64 (mockbuild@ip-10-0-1-79) (gcc version 7.3.1 20180303 (Red Hat 7.3.1-5) (GCC)) #1 SMP Wed Jul 25 18:47:15 UTC 2018
[ 0.000000] Command line: console=ttyS0 reboot=k panic=1 pci=off root=/dev/vda rw virtio_mmio.device=4K@0xd0000000:5
~...~
Starting default runlevel
[ 1.084236] clocksource: tsc: mask: 0xffffffffffffffff max_cycles: 0x211399552f8, max_idle_ns: 440795292447 ns
Welcome to Alpine Linux 3.8
Kernel 4.14.55-84.37.amzn2.x86_64 on an x86_64 (ttyS0)
localhost login:
- Firecracker: start a VM in less than a second
- Creating Custom rootfs and kernel Images
- firectl, a command-line tool to run Firecracker microVMs
- debian-firecracker builds the debian kernel and rootfs for firecracker
- firesquid, a Simple AWS Firecracker Orchestrator, in Rust
Rust API to interact with Firecracker