An ACME Shell script: acme.sh
- An ACME protocol client written purely in Shell (Unix shell) language.
- Full ACME protocol implementation.
- Support ECDSA certs
- Support SAN and wildcard certs
- Simple, powerful and very easy to use. You only need 3 minutes to learn it.
- Bash, dash and sh compatible.
- Purely written in Shell with no dependencies on python.
- Just one script to issue, renew and install your certificates automatically.
- DOES NOT require
- Docker ready
- IPv6 ready
- Cron job notifications for renewal or error etc.
It's probably the
easiest & smartest shell script to automatically issue & renew the free certificates.
For Docker Fans: acme.sh 💕 Docker
- CentOS Web Panel
|2||Windows (cygwin with curl, openssl and crontab included)|
|13||Alpine Linux (with curl)|
|11||-----||Cloud Linux https://github.com/acmesh-official/acme.sh/issues/111|
|22||-----||OpenWRT: Tested and working. See wiki page|
|23||Proxmox: See Proxmox VE Wiki. Version 4.x, 5.0, 5.1, version 5.2 and up|
Check our testing project:
- ZeroSSL.com CA(default)
- Letsencrypt.org CA
- BuyPass.com CA
- SSL.com CA
- Google.com Public CA
- Pebble strict Mode
- Any other RFC8555-compliant CA
- Webroot mode
- Standalone mode
- Standalone tls-alpn mode
- Apache mode
- Nginx mode
- DNS mode
- DNS alias mode
- Stateless mode
1. How to install
1. Install online
Check this project: https://github.com/acmesh-official/get.acme.sh
curl https://get.acme.sh | sh -s email@example.com
wget -O - https://get.acme.sh | sh -s firstname.lastname@example.org
2. Or, Install from git
Clone this project and launch installation:
git clone https://github.com/acmesh-official/acme.sh.git cd ./acme.sh ./acme.sh --install -m email@example.com
don't have to be root then, although
it is recommended.
Advanced Installation: https://github.com/acmesh-official/acme.sh/wiki/How-to-install
The installer will perform 3 actions:
- Create and copy
acme.shto your home dir (
~/.acme.sh/. All certs will be placed in this folder too.
- Create alias for:
- Create daily cron job to check and renew the certs if needed.
Cron entry example:
0 0 * * * "/home/user/.acme.sh"/acme.sh --cron --home "/home/user/.acme.sh" > /dev/null
After the installation, you must close the current terminal and reopen it to make the alias take effect.
Ok, you are ready to issue certs now.
Show help message:
root@v1:~# acme.sh -h
2. Just issue a cert
Example 1: Single domain.
acme.sh --issue -d example.com -w /home/wwwroot/example.com
acme.sh --issue -d example.com -w /home/username/public_html
acme.sh --issue -d example.com -w /var/www/html
Example 2: Multiple domains in the same cert.
acme.sh --issue -d example.com -d www.example.com -d cp.example.com -w /home/wwwroot/example.com
/var/www/html is the web root folder where you host your website files. You MUST have
write access to this folder.
Second argument "example.com" is the main domain you want to issue the cert for. You must have at least one domain there.
You must point and bind all the domains to the same webroot dir:
The certs will be placed in
The certs will be renewed automatically every 60 days.
3. Install the cert to Apache/Nginx etc.
After the cert is generated, you probably want to install/copy the cert to your Apache/Nginx or other servers. You MUST use this command to copy the certs to the target files, DO NOT use the certs files in ~/.acme.sh/ folder, they are for internal use only, the folder structure may change in the future.
acme.sh --install-cert -d example.com \ --cert-file /path/to/certfile/in/apache/cert.pem \ --key-file /path/to/keyfile/in/apache/key.pem \ --fullchain-file /path/to/fullchain/certfile/apache/fullchain.pem \ --reloadcmd "service apache2 force-reload"
acme.sh --install-cert -d example.com \ --key-file /path/to/keyfile/in/nginx/key.pem \ --fullchain-file /path/to/fullchain/nginx/cert.pem \ --reloadcmd "service nginx force-reload"
Only the domain is required, all the other parameters are optional.
The ownership and permission info of existing files are preserved. You can pre-create the files to define the ownership and permission.
Install/copy the cert/key to the production Apache or Nginx path.
The cert will be renewed every 60 days by default (which is configurable). Once the cert is renewed, the Apache/Nginx service will be reloaded automatically by the command:
service apache2 force-reload or
service nginx force-reload.
Please take care: The reloadcmd is very important. The cert can be automatically renewed, but, without a correct 'reloadcmd' the cert may not be flushed to your server(like nginx or apache), then your website will not be able to show renewed cert in 60 days.
4. Use Standalone server to issue cert
(requires you to be root/sudoer or have permission to listen on port 80 (TCP))
80 (TCP) MUST be free to listen on, otherwise you will be prompted to free it and try again.
acme.sh --issue --standalone -d example.com -d www.example.com -d cp.example.com
5. Use Standalone ssl server to issue cert
(requires you to be root/sudoer or have permission to listen on port 443 (TCP))
443 (TCP) MUST be free to listen on, otherwise you will be prompted to free it and try again.
acme.sh --issue --alpn -d example.com -d www.example.com -d cp.example.com
6. Use Apache mode
(requires you to be root/sudoer, since it is required to interact with Apache server)
If you are running a web server, it is recommended to use the
Particularly, if you are running an Apache server, you can use Apache mode instead. This mode doesn't write any files to your web root folder.
Just set string "apache" as the second argument and it will force use of apache plugin automatically.
acme.sh --issue --apache -d example.com -d www.example.com -d cp.example.com
This apache mode is only to issue the cert, it will not change your apache config files. You will need to configure your website config files to use the cert by yourself. We don't want to mess with your apache server, don't worry.
7. Use Nginx mode
(requires you to be root/sudoer, since it is required to interact with Nginx server)
If you are running a web server, it is recommended to use the
Particularly, if you are running an nginx server, you can use nginx mode instead. This mode doesn't write any files to your web root folder.
Just set string "nginx" as the second argument.
It will configure nginx server automatically to verify the domain and then restore the nginx config to the original version.
So, the config is not changed.
acme.sh --issue --nginx -d example.com -d www.example.com -d cp.example.com
This nginx mode is only to issue the cert, it will not change your nginx config files. You will need to configure your website config files to use the cert by yourself. We don't want to mess with your nginx server, don't worry.
8. Automatic DNS API integration
If your DNS provider supports API access, we can use that API to automatically issue the certs.
You don't have to do anything manually!
Currently acme.sh supports most of the dns providers:
9. Use DNS manual mode:
If your dns provider doesn't support any api access, you can add the txt record by hand.
acme.sh --issue --dns -d example.com -d www.example.com -d cp.example.com
You should get an output like below:
Add the following txt record: Domain:_acme-challenge.example.com Txt value:9ihDbjYfTExAYeDs4DBUeuTo18KBzwvTEjUnSwd32-c Add the following txt record: Domain:_acme-challenge.www.example.com Txt value:9ihDbjxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx Please add those txt records to the domains. Waiting for the dns to take effect.
Then just rerun with
acme.sh --renew -d example.com
Ok, it's done.
Take care, this is dns manual mode, it can not be renewed automatically. you will have to add a new txt record to your domain by your hand when you renew your cert.
Please use dns api mode instead.
10. Issue ECC certificates
Just set the
keylength parameter with a prefix
Single domain ECC certificate
acme.sh --issue -w /home/wwwroot/example.com -d example.com --keylength ec-256
SAN multi domain ECC certificate
acme.sh --issue -w /home/wwwroot/example.com -d example.com -d www.example.com --keylength ec-256
Please look at the
keylength parameter above.
Valid values are:
- ec-256 (prime256v1, "ECDSA P-256", which is the default key type)
- ec-384 (secp384r1, "ECDSA P-384")
- ec-521 (secp521r1, "ECDSA P-521", which is not supported by Let's Encrypt yet.)
- 2048 (RSA2048)
- 3072 (RSA3072)
- 4096 (RSA4096)
11. Issue Wildcard certificates
It's simple, just give a wildcard domain as the
acme.sh --issue -d example.com -d '*.example.com' --dns dns_cf
12. How to renew the certs
No, you don't need to renew the certs manually. All the certs will be renewed automatically every 60 days.
However, you can also force to renew a cert:
acme.sh --renew -d example.com --force
or, for ECC cert:
acme.sh --renew -d example.com --force --ecc
13. How to stop cert renewal
To stop renewal of a cert, you can execute the following to remove the cert from the renewal list:
acme.sh --remove -d example.com [--ecc]
The cert/key file is not removed from the disk.
You can remove the respective directory (e.g.
~/.acme.sh/example.com) by yourself.
14. How to upgrade
acme.sh is in constant development, so it's strongly recommended to use the latest code.
You can update acme.sh to the latest code:
You can also enable auto upgrade:
acme.sh --upgrade --auto-upgrade
Then acme.sh will be kept up to date automatically.
Disable auto upgrade:
acme.sh --upgrade --auto-upgrade 0
15. Issue a cert from an existing CSR
16. Send notifications in cronjob
17. Under the Hood
Speak ACME language using shell, directly to "Let's Encrypt".
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19. License & Others
License is GPLv3
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