Image Upload Service with GRPC

Wesley — Fri, 27 Mar 2020 01:20:03 +0000

Hello community!

I just shared on Github a repo containing a demonstration of image upload service in python, using imgur as the hosting.

As I started it mostly to get more used to the GRPC types and APIs, I noticed that there weren't many examples when searching for "python" + "GRPC" + "upload" + "stream".

Soon I realized that, once finished, if I organized it a bit (my experiments always start very messy), the project could be helpful to someone else.

So here is my contribution, in the hope that it is useful to somebody else in their learning process.

image-service

Setup Raspberry Pi 3 Model B+ with Ubuntu server and SSH over wifi

Wesley — Thu, 12 Sep 2019 00:49:47 +0000

Some things to say first:

At moment of testing the commands and writing this, I am using a ubuntu 18.04.3.
I don't have a Ethernet cable ¯\_㋡_/¯
My raspberry is the 3 Model B+ and my sdcard is a SAMSUNG EVO Select microSDXC 128 GB
This is my first post (treating it more like a "shared note") on dev.to community 🎉

Download the ubuntu image 18.04.3-preinstalled-server-arm64+raspi3.img.xz (link taken found here)
Flash the sdcard using balenaEtcher

sudo nano /media/wesley/writable/etc/netplan/50-cloud-init.yaml
It should contain:

network:
    version: 2
    ethernets:
        eth0:
            optional: true
            dhcp4: true
    wifis:
        wlan0:
            optional: true
            access-points:
                "YOUR-SSID-NAME":
                    password: "YOUR-NETWORK-PASSWORD"
            dhcp4: true

Make sure to have navigated to writable partition, otherwise nano will complain the folder does not exist.

sudo nano /media/wesley/writable/etc/cloud/cloud.cfg

Should be like this:

# The top level settings are used as module
# and system configuration.

# A set of users which may be applied and/or used by various modules
# when a 'default' entry is found it will reference the 'default_user'
# from the distro configuration specified below
users:
   - default
# If this is set, 'root' will not be able to ssh in and they
# will get a message to login instead as the default $user
disable_root: false

# This will cause the set+update hostname module to not operate (if true)
preserve_hostname: false
hostname: YOUR-RASPBERRYPI-NAME

# Example datasource config
# datasource:
#    Ec2:
#      metadata_urls: [ 'blah.com' ]
#      timeout: 5 # (defaults to 50 seconds)
#      max_wait: 10 # (defaults to 120 seconds)

# The modules that run in the 'init' stage
cloud_init_modules:
 - migrator
 - seed_random
 - bootcmd
 - write-files
 - growpart
 - resizefs
 - disk_setup
 - mounts
 - set_hostname
 - update_hostname
 - update_etc_hosts
 - ca-certs
 - rsyslog
 - users-groups
 - ssh

# The modules that run in the 'config' stage
cloud_config_modules:
# Emit the cloud config ready event
# this can be used by upstart jobs for 'start on cloud-config'.
 - emit_upstart
 - snap
 - snap_config  # DEPRECATED- Drop in version 18.2
 - ssh-import-id
 - locale
 - set-passwords
 - grub-dpkg
 - apt-pipelining
 - apt-configure
 - ubuntu-advantage
 - ntp
 - timezone
 - disable-ec2-metadata
 - runcmd
 - byobu

# The modules that run in the 'final' stage
cloud_final_modules:
 - snappy  # DEPRECATED- Drop in version 18.2
 - package-update-upgrade-install
 - fan
 - landscape
 - lxd
 - ubuntu-drivers
 - puppet
 - chef
 - mcollective
 - salt-minion
 - rightscale_userdata
 - scripts-vendor
 - scripts-per-once
 - scripts-per-boot
 - scripts-per-instance
 - scripts-user
 - ssh-authkey-fingerprints
 - keys-to-console
 - phone-home
 - final-message
 - power-state-change

# System and/or distro specific settings
# (not accessible to handlers/transforms)
system_info:
   # This will affect which distro class gets used
   distro: ubuntu
   # Default user name + that default users groups (if added/used)
   default_user:
     name: pi
     lock_passwd: True
     gecos: Pi
     groups: [adm, audio, cdrom, dialout, dip, floppy, lxd, netdev, plugdev, sudo, video]
     sudo: ["ALL=(ALL) NOPASSWD:ALL"]
     shell: /bin/bash
     ssh_authorized_keys:
       - "CONTENT-OF-YOUR-SSH-PUB-KEY-HERE"
   # Automatically discover the best ntp_client
   ntp_client: auto
   # Other config here will be given to the distro class and/or path classes
   paths:
      cloud_dir: /var/lib/cloud/
      templates_dir: /etc/cloud/templates/
      upstart_dir: /etc/init/
   package_mirrors:
     - arches: [i386, amd64]
       failsafe:
         primary: http://archive.ubuntu.com/ubuntu
         security: http://security.ubuntu.com/ubuntu
       search:
         primary:
           - http://%(ec2_region)s.ec2.archive.ubuntu.com/ubuntu/
           - http://%(availability_zone)s.clouds.archive.ubuntu.com/ubuntu/
           - http://%(region)s.clouds.archive.ubuntu.com/ubuntu/
         security: []
     - arches: [arm64, armel, armhf]
       failsafe:
         primary: http://ports.ubuntu.com/ubuntu-ports
         security: http://ports.ubuntu.com/ubuntu-ports
       search:
         primary:
           - http://%(ec2_region)s.ec2.ports.ubuntu.com/ubuntu-ports/
           - http://%(availability_zone)s.clouds.ports.ubuntu.com/ubuntu-ports/
           - http://%(region)s.clouds.ports.ubuntu.com/ubuntu-ports/
         security: []
     - arches: [default]
       failsafe:
         primary: http://ports.ubuntu.com/ubuntu-ports
         security: http://ports.ubuntu.com/ubuntu-ports
   ssh_svcname: ssh

Eject from your computer, inject the sdcard on the raspberry, connect the power and wait for about one minute.
ssh pi@YOUR-RASPBERRYPI-NAME

ℹ️ first time you login it will ask for a password (type ubuntu) and then to change to a new password.

Many thanks to l --marc l user on stackoverflow. Steps on this post are 90% from his answer here. The other 10% comes from the cloud-init docs

DEV Community: Wesley

Image Upload Service with GRPC

Setup Raspberry Pi 3 Model B+ with Ubuntu server and SSH over wifi