Amazon has a new Linux out called "Amazon Linux 2"

When I try and get certbot going....

 wget https://dl.eff.org/certbot-auto
 chmod a+x certbot-auto

gives this error

Sorry, I don't know how to bootstrap Certbot on your operating system!

You will need to install OS dependencies, configure virtualenv, and run pip install manually.
Please see https://letsencrypt.readthedocs.org/en/latest/contributing.html#prerequisites for more info.

Then I tried:

yum install pip
yum install python-pip
pip install cryptography 
pip install certbot
yum install python-urllib3
yum install augeas

And I get this message

Traceback (most recent call last):
  File "/usr/bin/certbot", line 7, in <module>
    from certbot.main import main
  File "/usr/lib/python2.7/site-packages/certbot/main.py", line 19, in <module>
    from certbot import client
  File "/usr/lib/python2.7/site-packages/certbot/client.py", line 11, in <module>
    from acme import client as acme_client
  File "/usr/lib/python2.7/site-packages/acme/client.py", line 34, in <module>
    import urllib3.contrib.pyopenssl  # pylint: disable=import-error
  File "/usr/lib/python2.7/site-packages/urllib3/contrib/pyopenssl.py", line 50, in <module>
    from ndg.httpsclient.ssl_peer_verification import SUBJ_ALT_NAME_SUPPORT
ImportError: No module named ndg.httpsclient.ssl_peer_verification

I am not sure where to go from here. Any suggestions would be greatly appreciated!

2 Answers 2


I was having trouble with this as well since Amazon Linux 2 doesn't have epel-release in its repositories, but I've found you can install the EPEL RPM package itself, and then you'll be able to install certbot or certbot-nginx from there.

  • Download the RPM

    curl -O http://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
  • Then install it

    sudo yum install epel-release-latest-7.noarch.rpm
  • Now you can install certbot

    sudo yum install certbot
  • And then run it as usual

    sudo certbot

Check out the certbot page for configuration details after that.


Instead of Certbot you can use Acme, which works and is well documented. I have a tutorial on setting up Let's Encrypt on Amazon Linux here.

Nginx Configuration

Let's Encrypt needs to call out to the server to verify the request before a certificate is issued. Acmetool can use its built in web server or an external web server. Here's my Nginx configuration, which sits alongside a secure server block that serves the rest of the site.

# This server directly serves ACME / certificate redirects. All other requests are forwarded the https version of the page
server {
  listen 80;
  server_name example.com;
  access_log /var/log/nginx/access.log main;

  # Let's Encrypt certificates with Acmetool
    location /.well-known/acme-challenge/ {
    alias /var/www/.well-known/acme-challenge/;

  location / {
    return 301 https://www.photographerstechsupport.com$request_uri;

Nginx Folders

mkdir -p /var/www/.well-known/acme-challenge
chmod -R user:www-data /var/www/acme-challenge/*
find /var/www/acme-challenge/ -type d -exec chmod 755 {} \;
vi /var/www/acme-challenge/.well-known/acme-challenge/text.html   (add "hello world" or similar)

Install Acme

sudo -i   (this is run as root)
cd /opt
wget https://github.com/hlandau/acme/releases/download/v0.0.62/acmetool-v0.0.62-linux_386.tar.gz (NB check for newer versions here)
tar -xzf acmetool-v0.0.62-linux_386.tar.gz
cd acmetool-v0.0.62-linux_386/bin
cp ./acmetool /usr/local/bin
/usr/local/bin/acmetool quickstart

In the quickstart enter this as your webroot


Request a Certificate

/usr/local/bin/acmetool want example.com www.example.com

Troubleshooting #1

acmetool --xlog.severity=debug > /tmp/dump 2>&1 want example.com www.example.com
fgrep -v fdb: /tmp/dump | fgrep -v storageops: > /tmp/dumpout

I have other troubleshooting tips on my blog article.

  • This works on Amazon Linux 2 - Thanks. It looks like it will take months to verify that it is going to keep working, since there is no --force in acmetool
    – iewebguy
    Jan 1, 2018 at 20:09
  • You can delete the certificates and have them generated again. I always take a backup before I do anything with certificates, because I don't do this very often I find them a bit complex.
    – Tim
    Jan 1, 2018 at 20:14
  • good point, I'll try that
    – iewebguy
    Jan 2, 2018 at 15:31

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