Certbot报错：未找到合适的TLS CA证书包 [Archlinux]

Hey there, let's work through this Certbot issue step by step—you don't need to generate the CA certificate package yourself; the problem is likely a missing system or Certbot-specific CA bundle. Here's what to do:

1. Check your system's existing CA certificate bundle #

First, verify if your Linux system already has a valid CA certificate bundle installed. Most systems store this at /etc/ssl/certs/ca-certificates.crt. Run this command to check:

ls /etc/ssl/certs/ca-certificates.crt

If the file exists, specify it directly in your Certbot command using the --tls-cert-path flag, like this:

sudo certbot certonly --webroot -w /path/to/your/webroot --tls-cert-path /etc/ssl/certs/ca-certificates.crt -d yourdomain.com

2. Install/update system CA certificates #

If the bundle file doesn't exist, you need to install the system's CA certificate package. Use the command matching your distro:

• For Debian/Ubuntu-based systems:

  sudo apt-get update && sudo apt-get install ca-certificates
  sudo update-ca-certificates
  

• For RHEL/CentOS-based systems:

  sudo yum install ca-certificates
  sudo update-ca-trust
  

This will populate the system's CA bundle with trusted root certificates, including Let's Encrypt's.

3. Manually fetch Let's Encrypt's CA bundle (if system install doesn't work) #

If the system bundle still isn't being recognized by your old Certbot version, you can manually grab Let's Encrypt's CA certificates and create a custom bundle. Run this command to pull the certificates from Let's Encrypt's ACME server:

openssl s_client -showcerts -connect acme-v02.api.letsencrypt.org:443 </dev/null | sed -n '/-----BEGIN CERTIFICATE-----/,/-----END CERTIFICATE-----/p' > letsencrypt-ca.pem

Then point Certbot to this file with:

sudo certbot certonly --webroot -w /path/to/your/webroot --tls-cert-path ./letsencrypt-ca.pem -d yourdomain.com

4. Bonus: Consider upgrading Certbot (if possible) #

Your Certbot version (0.21.1-1) is quite outdated—releases after this include better handling of CA bundles and numerous bug fixes. If your environment allows it, upgrading to a newer version might prevent this issue entirely.

内容的提问来源于stack exchange，提问作者user9443103