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@ -1,21 +1,23 @@
# An ACME Shell script: acme.sh [![Build Status](https://travis-ci.org/Neilpang/acme.sh.svg?branch=master)](https://travis-ci.org/Neilpang/acme.sh)
- An ACME protocol client written purely in Shell (Unix shell) language.
- Fully ACME protocol implementation.
- Simple, powerful and very easy to use. You only need 3 minutes to learn.
- Bash, dash and sh compatible.
- Full ACME protocol implementation.
- Simple, powerful and very easy to use. You only need 3 minutes to learn it.
- Bash, dash and sh compatible.
- Simplest shell script for Let's Encrypt free certificate client.
- Purely written in Shell with no dependencies on python or Let's Encrypt official client.
- Just one script, to issue, renew and install your certificates automatically.
- Purely written in Shell with no dependencies on python or the official Let's Encrypt client.
- Just one script to issue, renew and install your certificates automatically.
- DOES NOT require `root/sudoer` access.
It's probably the `easiest&smallest&smartest` shell script to automatically issue & renew the free certificates from Let's Encrypt.
Wiki: https://github.com/Neilpang/acme.sh/wiki
# [中文说明](https://github.com/Neilpang/acme.sh/wiki/%E8%AF%B4%E6%98%8E)
#Tested OS
# Tested OS
| NO | Status| Platform|
|----|-------|---------|
|1|[![](https://cdn.rawgit.com/Neilpang/acmetest/master/status/ubuntu-latest.svg)](https://github.com/Neilpang/letest#here-are-the-latest-status)| Ubuntu
@ -38,41 +40,39 @@ Wiki: https://github.com/Neilpang/acme.sh/wiki
|18|[![](https://cdn.rawgit.com/Neilpang/acmetest/master/status/solaris.svg)](https://github.com/Neilpang/letest#here-are-the-latest-status)|SunOS/Solaris
|19|[![](https://cdn.rawgit.com/Neilpang/acmetest/master/status/gentoo-stage3-amd64.svg)](https://github.com/Neilpang/letest#here-are-the-latest-status)|Gentoo Linux
For all build statuses, check our [daily build project](https://github.com/Neilpang/acmetest):
For all build statuses, check our [daily build project](https://github.com/Neilpang/acmetest):
https://github.com/Neilpang/acmetest
# Supported Mode
1. Webroot mode
2. Standalone mode
3. Apache mode
4. Dns mode
# Supported modes
- Webroot mode
- Standalone mode
- Apache mode
- DNS mode
# 1. How to install
### 1. Install online:
### 1. Install online
Check this project: https://github.com/Neilpang/get.acme.sh
```bash
curl https://get.acme.sh | sh
```
Or:
```bash
wget -O - https://get.acme.sh | sh
```
### 2. Or, Install from git:
### 2. Or, Install from git
Clone this project:
Clone this project and launch installation:
```bash
git clone https://github.com/Neilpang/acme.sh.git
@ -82,14 +82,14 @@ cd ./acme.sh
You `don't have to be root` then, although `it is recommended`.
Advanced Installation: https://github.com/Neilpang/acme.sh/wiki/How-to-install
Advanced Installation: https://github.com/Neilpang/acme.sh/wiki/How-to-install
The installer will perform 3 actions:
1. Create and copy `acme.sh` to your home dir (`$HOME`): `~/.acme.sh/`.
All certs will be placed in this folder.
2. Create alias for: `acme.sh=~/.acme.sh/acme.sh`.
3. Create everyday cron job to check and renew the cert if needed.
1. Create and copy `acme.sh` to your home dir (`$HOME`): `~/.acme.sh/`.
All certs will be placed in this folder too.
2. Create alias for: `acme.sh=~/.acme.sh/acme.sh`.
3. Create daily cron job to check and renew the certs if needed.
Cron entry example:
@ -97,18 +97,17 @@ 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 current terminal and reopen again to make the alias take effect.
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.
Ok, you are ready to issue cert now.
Show help message:
```
root@v1:~# acme.sh -h
```
# 2. Just issue a cert:
# 2. Just issue a cert
**Example 1:** Single domain.
@ -119,56 +118,57 @@ acme.sh --issue -d example.com -w /home/wwwroot/example.com
**Example 2:** Multiple domains in the same cert.
```bash
acme.sh --issue -d example.com -d www.example.com -d cp.example.com -w /home/wwwroot/example.com
acme.sh --issue -d example.com -d www.example.com -d cp.example.com -w /home/wwwroot/example.com
```
The parameter `/home/wwwroot/example.com` is the web root folder. You **MUST** have `write access` to this folder.
Second argument **"example.com"** is the main domain you want to issue cert for.
You must have at least a domain there.
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: `/home/wwwroot/example.com`.
Generate/issued certs will be placed in `~/.acme.sh/example.com/`
Generated/issued certs will be placed in `~/.acme.sh/example.com/`
The issued cert will be renewed every **60** days automatically.
The issued cert will be renewed automatically every **60** days.
More examples: https://github.com/Neilpang/acme.sh/wiki/How-to-issue-a-cert
# 3. Install the issued cert to apache/nginx etc.
# 3. Install the issued cert to Apache/Nginx etc.
After you issue a cert, you probably want to install/copy the cert to your nginx/apache 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 future.
After you issue a cert, 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.
**nginx** example
**Apache** example:
```bash
acme.sh --installcert -d example.com \
--keypath /path/to/keyfile/in/nginx/key.pem \
--fullchainpath path/to/fullchain/nginx/cert.pem \
--reloadcmd "service nginx restart"
--certpath /path/to/certfile/in/apache/cert.pem \
--keypath /path/to/keyfile/in/apache/key.pem \
--fullchainpath /path/to/fullchain/certfile/apache/fullchain.pem \
--reloadcmd "service apache2 restart"
```
**apache** example
**Nginx** example:
```bash
acme.sh --installcert -d example.com \
--certpath /path/to/certfile/in/apache/cert.pem \
--keypath /path/to/keyfile/in/apache/key.pem \
--fullchainpath path/to/fullchain/certfile/apache/fullchain.pem \
--reloadcmd "service apache2 restart"
--keypath /path/to/keyfile/in/nginx/key.pem \
--fullchainpath /path/to/fullchain/nginx/cert.pem \
--reloadcmd "service nginx restart"
```
Only the domain is required, all the other parameters are optional.
Install/copy the issued cert/key to the production apache or nginx path.
Install/copy the issued 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 restarted automatically by the command: `service apache2 restart` or `service nginx restart`.
The cert will be `renewed every **60** days by default` (which is configurable). Once the cert is renewed, the apache/nginx will be automatically reloaded by the command: `service apache2 reload` or `service nginx reload`.
# 4. Use Standalone server to issue cert
**(requires you be root/sudoer, or you have permission to listen tcp 80 port)**
**(requires you to be root/sudoer or have permission to listen on port 80 (TCP))**
The tcp `80` port **MUST** be free to listen, otherwise you will be prompted to free the `80` port and try again.
Port `80` (TCP) **MUST** be free to listen on, otherwise you will be prompted to free it and try again.
```bash
acme.sh --issue --standalone -d example.com -d www.example.com -d cp.example.com
@ -176,13 +176,14 @@ acme.sh --issue --standalone -d example.com -d www.example.com -d cp.example.com
More examples: https://github.com/Neilpang/acme.sh/wiki/How-to-issue-a-cert
# 5. Use Standalone tls server to issue cert
**(requires you be root/sudoer, or you have permission to listen tcp 443 port)**
# 5. Use Standalone TLS server to issue cert
**(requires you to be root/sudoer or have permission to listen on port 443 (TCP))**
acme.sh supports `tls-sni-01` validation.
The tcp `443` port **MUST** be free to listen, otherwise you will be prompted to free the `443` port and try again.
Port `443` (TCP) **MUST** be free to listen on, otherwise you will be prompted to free it and try again.
```bash
acme.sh --issue --tls -d example.com -d www.example.com -d cp.example.com
@ -190,31 +191,33 @@ acme.sh --issue --tls -d example.com -d www.example.com -d cp.example.com
More examples: https://github.com/Neilpang/acme.sh/wiki/How-to-issue-a-cert
# 6. Use Apache mode
**(requires you be root/sudoer, since it is required to interact with apache server)**
**(requires you to be root/sudoer, since it is required to interact with Apache server)**
If you are running a web server, apache or nginx, it is recommended to use the `Webroot mode`.
If you are running a web server, Apache or Nginx, it is recommended to use the `Webroot mode`.
Particularly, if you are running an apache server, you should use apache mode instead. This mode doesn't write any files to your web root folder.
Particularly, if you are running an Apache server, you should use Apache mode instead. This mode doesn't write any files to your web root folder.
Just set string "apache" as the second argument, it will force use of apache plugin automatically.
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 user.example.com
acme.sh --issue --apache -d example.com -d www.example.com -d cp.example.com
```
More examples: https://github.com/Neilpang/acme.sh/wiki/How-to-issue-a-cert
# 7. Use DNS mode:
Support the `dns-01` challenge.
```bash
acme.sh --issue --dns -d example.com -d www.example.com -d user.example.com
acme.sh --issue --dns -d example.com -d www.example.com -d cp.example.com
```
You should get the output like below:
You should get an output like below:
```
Add the following txt record:
@ -226,7 +229,6 @@ 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 `renew` argument:
@ -237,53 +239,54 @@ acme.sh --renew -d example.com
Ok, it's finished.
# 8. Automatic DNS API integration
If your DNS provider supports API access, we can use API to automatically issue the certs.
If your DNS provider supports API access, we can use that API to automatically issue the certs.
You don't have do anything manually!
You don't have to do anything manually!
### Currently acme.sh supports:
1. Cloudflare.com API
2. Dnspod.cn API
3. Cloudxns.com API
4. Godaddy.com API
5. OVH, kimsufi, soyoustart and runabove API
6. AWS Route 53, see: https://github.com/Neilpang/acme.sh/issues/65
7. PowerDNS API
8. lexicon dns api: https://github.com/Neilpang/acme.sh/wiki/How-to-use-lexicon-dns-api
(DigitalOcean, DNSimple, DnsMadeEasy, DNSPark, EasyDNS, Namesilo, NS1, PointHQ, Rage4 and Vultr etc.)
9. LuaDNS.com API
10. DNSMadeEasy.com API
11. nsupdate
- CloudFlare.com API
- DNSPod.cn API
- CloudXNS.com API
- GoDaddy.com API
- OVH, kimsufi, soyoustart and runabove API
- AWS Route 53, see: https://github.com/Neilpang/acme.sh/issues/65
- PowerDNS.com API
- lexicon DNS API: https://github.com/Neilpang/acme.sh/wiki/How-to-use-lexicon-dns-api
(DigitalOcean, DNSimple, DNSMadeEasy, DNSPark, EasyDNS, Namesilo, NS1, PointHQ, Rage4 and Vultr etc.)
- LuaDNS.com API
- DNSMadeEasy.com API
##### More APIs are coming soon...
**More APIs coming soon...**
If your DNS provider is not on the supported list above, you can write your own script API easily. If you do please consider submitting a [Pull Request](https://github.com/Neilpang/acme.sh/pulls) and contribute to the project.
If your DNS provider is not on the supported list above, you can write your own DNS API script easily. If you do, please consider submitting a [Pull Request](https://github.com/Neilpang/acme.sh/pulls) and contribute it to the project.
For more details: [How to use dns api](dnsapi)
For more details: [How to use DNS API](dnsapi)
# 9. Issue ECC certificate:
`Let's Encrypt` now can issue **ECDSA** certificates.
# 9. Issue ECC certificates
And we also support it.
`Let's Encrypt` can now issue **ECDSA** certificates.
And we support them too!
Just set the `length` parameter with a prefix `ec-`.
For example:
### Single domain ECC cerfiticate:
### Single domain ECC cerfiticate
```bash
acme.sh --issue -w /home/wwwroot/example.com -d example.com --keylength ec-256
acme.sh --issue -w /home/wwwroot/example.com -d example.com --keylength ec-256
```
SAN multi domain ECC certificate:
### SAN multi domain ECC certificate
```bash
acme.sh --issue -w /home/wwwroot/example.com -d example.com -d www.example.com --keylength ec-256
acme.sh --issue -w /home/wwwroot/example.com -d example.com -d www.example.com --keylength ec-256
```
Please look at the last parameter above.
@ -295,40 +298,48 @@ Valid values are:
3. **ec-521 (secp521r1, "ECDSA P-521", which is not supported by Let's Encrypt yet.)**
# 10. How to renew the cert
# 10. How to renew the issued certs
No, you don't need to renew the certs manually. All the certs will be renewed automatically every **60** days.
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 any cert:
```
acme.sh --renew -d example.com --force
acme.sh --renew -d example.com --force
```
or, for ECC cert:
```
acme.sh --renew -d example.com --force --ecc
acme.sh --renew -d example.com --force --ecc
```
# 11. How to upgrade `acme.sh`
acme.sh is in developing, it's strongly recommended to use the latest code.
acme.sh is in constant developement, so it's strongly recommended to use the latest code.
You can update acme.sh to the latest code:
```
acme.sh --upgrade
```
You can enable auto upgrade:
You can also enable auto upgrade:
```
acme.sh --upgrade --auto-upgrade
acme.sh --upgrade --auto-upgrade
```
Then **acme.sh** will keep up to date automatically.
Then **acme.sh** will be kept up to date automatically.
Disable auto upgrade:
```
acme.sh --upgrade --auto-upgrade 0
acme.sh --upgrade --auto-upgrade 0
```
# 12. Issue a cert from an existing CSR
https://github.com/Neilpang/acme.sh/wiki/Issue-a-cert-from-existing-CSR
@ -340,22 +351,25 @@ Speak ACME language using shell, directly to "Let's Encrypt".
TODO:
# Acknowledgment
# Acknowledgments
1. Acme-tiny: https://github.com/diafygi/acme-tiny
2. ACME protocol: https://github.com/ietf-wg-acme/acme
3. Certbot: https://github.com/certbot/certbot
# License & Others
License is GPLv3
Please Star and Fork me.
[Issues](https://github.com/Neilpang/acme.sh/issues) and [pull requests](https://github.com/Neilpang/acme.sh/pulls) are welcomed.
[Issues](https://github.com/Neilpang/acme.sh/issues) and [pull requests](https://github.com/Neilpang/acme.sh/pulls) are welcome.
# Donate
1. PayPal: donate@acme.sh
1. PayPal: donate@acme.sh
[Donate List](https://github.com/Neilpang/acme.sh/wiki/Donate-list)

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dnsapi/README.md
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@ -1,99 +1,80 @@
# How to use dns api
# How to use DNS API
## 1. Use CloudFlare domain api to automatically issue cert
## 1. Use CloudFlare domain API to automatically issue cert
For now, we support clourflare integeration.
First you need to login to your clourflare account to get your api key.
First you need to login to your CloudFlare account to get your API key.
```
export CF_Key="sdfsdfsdfljlbjkljlkjsdfoiwje"
export CF_Email="xxxx@sss.com"
```
Ok, let's issue cert now:
Ok, let's issue a cert now:
```
acme.sh --issue --dns dns_cf -d example.com -d www.example.com
acme.sh --issue --dns dns_cf -d example.com -d www.example.com
```
The `CF_Key` and `CF_Email` will be saved in `~/.acme.sh/account.conf`, when next time you use cloudflare api, it will reuse this key.
The `CF_Key` and `CF_Email` will be saved in `~/.acme.sh/account.conf` and will be reused when needed.
## 2. Use DNSPod.cn domain API to automatically issue cert
## 2. Use Dnspod.cn domain api to automatically issue cert
For now, we support dnspod.cn integeration.
First you need to login to your dnspod.cn account to get your api key and key id.
First you need to login to your DNSPod account to get your API Key and ID.
```
export DP_Id="1234"
export DP_Key="sADDsdasdgdsf"
```
Ok, let's issue cert now:
Ok, let's issue a cert now:
```
acme.sh --issue --dns dns_dp -d example.com -d www.example.com
acme.sh --issue --dns dns_dp -d example.com -d www.example.com
```
The `DP_Id` and `DP_Key` will be saved in `~/.acme.sh/account.conf`, when next time you use dnspod.cn api, it will reuse this key.
The `DP_Id` and `DP_Key` will be saved in `~/.acme.sh/account.conf` and will be reused when needed.
## 3. Use Cloudxns.com domain api to automatically issue cert
## 3. Use CloudXNS.com domain API to automatically issue cert
For now, we support Cloudxns.com integeration.
First you need to login to your Cloudxns.com account to get your api key and key secret.
First you need to login to your CloudXNS account to get your API Key and Secret.
```
export CX_Key="1234"
export CX_Secret="sADDsdasdgdsf"
```
Ok, let's issue cert now:
Ok, let's issue a cert now:
```
acme.sh --issue --dns dns_cx -d example.com -d www.example.com
acme.sh --issue --dns dns_cx -d example.com -d www.example.com
```
The `CX_Key` and `CX_Secret` will be saved in `~/.acme.sh/account.conf`, when next time you use Cloudxns.com api, it will reuse this key.
The `CX_Key` and `CX_Secret` will be saved in `~/.acme.sh/account.conf` and will be reused when needed.
## 4. Use Godaddy.com domain api to automatically issue cert
## 4. Use GoDaddy.com domain API to automatically issue cert
We support Godaddy integration.
First you need to login to your Godaddy account to get your api key and api secret.
First you need to login to your GoDaddy account to get your API Key and Secret.
https://developer.godaddy.com/keys/
Please Create a Production key, instead of a Test key.
Please create a Production key, instead of a Test key.
```
export GD_Key="sdfsdfsdfljlbjkljlkjsdfoiwje"
export GD_Secret="asdfsdafdsfdsfdsfdsfdsafd"
```
Ok, let's issue cert now:
Ok, let's issue a cert now:
```
acme.sh --issue --dns dns_gd -d example.com -d www.example.com
acme.sh --issue --dns dns_gd -d example.com -d www.example.com
```
The `GD_Key` and `GD_Secret` will be saved in `~/.acme.sh/account.conf`, when next time you use cloudflare api, it will reuse this key.
The `GD_Key` and `GD_Secret` will be saved in `~/.acme.sh/account.conf` and will be reused when needed.
## 5. Use PowerDNS embedded api to automatically issue cert
We support PowerDNS embedded API integration.
## 5. Use PowerDNS embedded API to automatically issue cert
First you need to enable api and set your api-token in PowerDNS configuration.
First you need to login to your PowerDNS account to enable the API and set your API-Token in the configuration.
https://doc.powerdns.com/md/httpapi/README/
@ -102,21 +83,21 @@ export PDNS_Url="http://ns.example.com:8081"
export PDNS_ServerId="localhost"
export PDNS_Token="0123456789ABCDEF"
export PDNS_Ttl=60
```
Ok, let's issue cert now:
Ok, let's issue a cert now:
```
acme.sh --issue --dns dns_pdns -d example.com -d www.example.com
acme.sh --issue --dns dns_pdns -d example.com -d www.example.com
```
The `PDNS_Url`, `PDNS_ServerId`, `PDNS_Token` and `PDNS_Ttl` will be saved in `~/.acme.sh/account.conf`.
The `PDNS_Url`, `PDNS_ServerId`, `PDNS_Token` and `PDNS_Ttl` will be saved in `~/.acme.sh/account.conf` and will be reused when needed.
## 6. Use OVH/kimsufi/soyoustart/runabove API
## 6. Use OVH/kimsufi/soyoustart/runabove API to automatically issue cert
https://github.com/Neilpang/acme.sh/wiki/How-to-use-OVH-domain-api
## 7. Use nsupdate to automatically issue cert
First, generate a key for updating the zone
@ -137,6 +118,7 @@ include "/etc/named/keys/update.key";
```
Next, configure your zone to allow dynamic updates.
Depending on your named version, use either
```
zone "example.com" {
@ -153,18 +135,21 @@ zone "example.com" {
};
}
```
Finally, make the dns server and update key available to `acme.sh`
Finally, make the DNS server and update Key available to `acme.sh`
```
export NSUPDATE_SERVER=dns.example.com
export NSUPDATE_KEY=aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa==
export NSUPDATE_SERVER="dns.example.com"
export NSUPDATE_KEY="aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa=="
```
Ok, let's issue cert now:
Ok, let's issue a cert now:
```
acme.sh --issue --dns dns_nsupdate -d example.com -d www.example.com
acme.sh --issue --dns dns_nsupdate -d example.com -d www.example.com
```
The `NSUPDATE_SERVER` and `NSUPDATE_KEY` settings will be saved in `~/.acme.sh/account.conf`.
The `NSUPDATE_SERVER` and `NSUPDATE_KEY` settings will be saved in `~/.acme.sh/account.conf` and will be reused when needed.
## 8. Use LuaDNS domain API
@ -172,17 +157,16 @@ Get your API token at https://api.luadns.com/settings
```
export LUA_Key="sdfsdfsdfljlbjkljlkjsdfoiwje"
export LUA_Email="xxxx@sss.com"
```
To issue a cert:
```
acme.sh --issue --dns dns_lua --dnssleep 3 -d example.com -d www.example.com
acme.sh --issue --dns dns_lua -d example.com -d www.example.com
```
The `LUA_Key` and `LUA_Email` will be saved in `~/.acme.sh/account.conf`, and will be reused when needed.
The `LUA_Key` and `LUA_Email` will be saved in `~/.acme.sh/account.conf` and will be reused when needed.
## 9. Use DNSMadeEasy domain API
@ -190,39 +174,34 @@ Get your API credentials at https://cp.dnsmadeeasy.com/account/info
```
export ME_Key="sdfsdfsdfljlbjkljlkjsdfoiwje"
export ME_Secret="qdfqsdfkjdskfj"
```
To issue a cert:
```
acme.sh --issue --dns dns_me --dnssleep 3 -d example.com -d www.example.com
acme.sh --issue --dns dns_me -d example.com -d www.example.com
```
The `ME_Key` and `ME_Secret` will be saved in `~/.acme.sh/account.conf`, and will be reused when needed.
The `ME_Key` and `ME_Secret` will be saved in `~/.acme.sh/account.conf` and will be reused when needed.
# 10. Use custom api
If your api is not supported yet, you can write your own dns api.
# 10. Use custom API
Let's assume you want to name it 'myapi',
If your API is not supported yet, you can write your own DNS API.
1. Create a bash script named `~/.acme.sh/dns_myapi.sh`,
2. In the script, you must have a function named `dns_myapi_add()`. Which will be called by acme.sh to add dns records.
3. Then you can use your api to issue cert like:
Let's assume you want to name it 'myapi':
1. Create a bash script named `~/.acme.sh/dns_myapi.sh`,
2. In the script you must have a function named `dns_myapi_add()` which will be called by acme.sh to add the DNS records.
3. Then you can use your API to issue cert like this:
```
acme.sh --issue --dns dns_myapi -d example.com -d www.example.com
acme.sh --issue --dns dns_myapi -d example.com -d www.example.com
```
For more details, please check our sample script: [dns_myapi.sh](dns_myapi.sh)
# 11. Use lexicon dns api
## 11. Use lexicon DNS API
https://github.com/Neilpang/acme.sh/wiki/How-to-use-lexicon-dns-api