94 lines
3.7 KiB
Markdown
94 lines
3.7 KiB
Markdown
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---
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title: "router7: installation"
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menu:
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main:
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title: "Installation"
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weight: 30
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---
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# Installation
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Connect your serial adapter ([usbcom1a](https://pcengines.ch/usbcom1a.htm) works well if you don’t have one already) to the apu2c4 and start a program to use it, e.g. `screen /dev/ttyUSB0 115200`. Then, power on the apu2c4 and configure it to do PXE boot:
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* Press `F10` to enter the boot menu
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* Press `3` to enter setup
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* Press `n` to enable network boot
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* Press `c` to move mSATA to the top of the boot order
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* Press `e` to move iPXE to the top of the boot order
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* Press `s` to save configuration and exit
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Connect a network cable on `net0`, the port closest to the serial console port:
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<img src="https://github.com/rtr7/router7/raw/master/devsetup.jpg"
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width="800" alt="router7 development setup">
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Next, build a router7 image:
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```shell
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go get -u github.com/gokrazy/tools/cmd/gokr-packer github.com/rtr7/tools/cmd/...
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go get -u -d github.com/rtr7/router7
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mkdir /tmp/recovery
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GOARCH=amd64 gokr-packer \
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-hostname=router7 \
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-overwrite_boot=/tmp/recovery/boot.img \
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-overwrite_mbr=/tmp/recovery/mbr.img \
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-overwrite_root=/tmp/recovery/root.img \
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-kernel_package=github.com/rtr7/kernel \
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-firmware_package=github.com/rtr7/kernel \
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-gokrazy_pkgs=github.com/gokrazy/gokrazy/cmd/ntp \
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-serial_console=ttyS0,115200n8 \
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github.com/rtr7/router7/cmd/...
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```
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Run `rtr7-recover -boot=/tmp/recovery/boot.img -mbr=/tmp/recovery/mbr.img -root=/tmp/recovery/root.img` to:
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* trigger a reset [if a Teensy with the rebootor firmware is attached](#rebootor)
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* serve a DHCP lease to all clients which request PXE boot (i.e., your apu2c4)
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* serve via TFTP:
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* the PXELINUX bootloader
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* the router7 kernel
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* an initrd archive containing the rtr7-recovery-init program and mke2fs
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* serve via HTTP the boot and root images
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* optionally serve via HTTP a backup.tar.gz image containing files for `/perm` (e.g. for moving to new hardware, rolling back corrupted state, or recovering from a disk failure)
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* exit once the router successfully wrote the images to disk
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## Updates
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Run e.g. `rtr7-safe-update -updates_dir=$HOME/router7/updates` to:
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* verify the router currently has connectivity, abort the update otherwise
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* download a backup archive of `/perm`
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* build a new image
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* update the router
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* wait until the router restored connectivity, roll back the update using `rtr7-recover` otherwise
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The update step uses kexec to reduce the downtime to approximately 15 seconds.
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## Manual Recovery
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Given `rtr7-safe-update`’s safeguards, manual recovery should rarely be required.
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To manually roll back to an older image, invoke `rtr7-safe-update` via the
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`recover.bash` script in the image directory underneath `-updates_dir`, e.g.:
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```shell
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% cd ~/router7/updates/2018-07-03T17:33:52+02:00
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% ./recover.bash
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```
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## Teensy rebootor {#rebootor}
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The cheap and widely-available [Teensy++ USB development board](https://www.pjrc.com/store/teensypp.html) comes with a firmware called rebootor, which is used by the [`teensy_loader_cli`](https://www.pjrc.com/teensy/loader_cli.html) program to perform hard resets.
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This setup can be used to programmatically reset the apu2c4 (from `rtr7-recover`) by connecting the Teensy++ to the [apu2c4’s reset pins](http://pcengines.ch/pdf/apu2.pdf):
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* connect the Teensy++’s `GND` pin to the apu2c4 J2’s pin 4 (`GND`)
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* connect the Teensy++’s `B7` pin to the apu2c4 J2’s pin 5 (`3.3V`, resets when pulled to `GND`)
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You can find a working rebootor firmware .hex file at https://github.com/PaulStoffregen/teensy_loader_cli/issues/38
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## Prometheus
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See https://github.com/rtr7/router7/tree/master/contrib/prometheus for example
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configuration files, and install the [router7 Grafana
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Dashboard](https://grafana.com/dashboards/8288).
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