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# ACME
Automatic HTTPS
{: .subtitle }
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You can configure Traefik to use an ACME provider (like Let's Encrypt) for automatic certificate generation.
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!!! warning "Let's Encrypt and Rate Limiting"
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Note that Let's Encrypt API has [rate limiting ](https://letsencrypt.org/docs/rate-limits ).
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## Configuration Examples
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??? example "Enabling ACME"
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```toml
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[entrypoints]
[entrypoints.web]
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address = ":80"
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[entrypoints.http-tls]
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address = ":443"
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[acme] # every router with TLS enabled will now be able to use ACME for its certificates
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email = "your-email@your-domain.org"
storage = "acme.json"
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onHostRule = true # dynamic generation based on the Host() & HostSNI() matchers
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[acme.httpChallenge]
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entryPoint = "web" # used during the challenge
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```
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??? example "Configuring Wildcard Certificates"
```toml
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[entrypoints]
[entrypoints.web]
address = ":80"
[entrypoints.http-tls]
address = ":443"
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[acme]
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email = "your-email@your-domain.org"
storage = "acme.json"
[acme.dnsChallenge]
provider = "xxx"
[[acme.domains]]
main = "*.mydomain.com"
sans = ["mydomain.com"]
```
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!!! note "Configuration Reference"
There are many available options for ACME. For a quick glance at what's possible, browse the [configuration reference ](../reference/acme.md ).
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## The Different ACME Challenges
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### `tlsChallenge`
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Use the `TLS-ALPN-01` challenge to generate and renew ACME certificates by provisioning a TLS certificate.
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As described on the Let's Encrypt [community forum ](https://community.letsencrypt.org/t/support-for-ports-other-than-80-and-443/3419/72 ),
when using the `TLS-ALPN-01` challenge, Traefik must be reachable by Let's Encrypt through port 443.
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??? example "Configuring the `tlsChallenge` "
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```toml
[acme]
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[acme.tlsChallenge]
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```
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### `httpChallenge`
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Use the `HTTP-01` challenge to generate and renew ACME certificates by provisioning an HTTP resource under a well-known URI.
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As described on the Let's Encrypt [community forum ](https://community.letsencrypt.org/t/support-for-ports-other-than-80-and-443/3419/72 ),
when using the `HTTP-01` challenge, `acme.httpChallenge.entryPoint` must be reachable by Let's Encrypt through port 80.
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??? example "Using an EntryPoint Called http for the `httpChallenge` "
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```toml
[acme]
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# ...
[acme.httpChallenge]
entryPoint = "http"
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```
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!!! note
Redirection is fully compatible with the `HTTP-01` challenge.
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### `dnsChallenge`
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Use the `DNS-01` challenge to generate and renew ACME certificates by provisioning a DNS record.
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??? example "Configuring a `dnsChallenge` with the DigitalOcean Provider"
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```toml
[acme]
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# ...
[acme.dnsChallenge]
provider = "digitalocean"
delayBeforeCheck = 0
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# ...
```
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!!! important
A `provider` is mandatory.
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#### `providers`
Here is a list of supported `providers` , that can automate the DNS verification,
along with the required environment variables and their [wildcard & root domain support ](#wildcard-domains ).
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Do not hesitate to complete it.
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| Provider Name | Provider Code | Environment Variables | Wildcard & Root Domain Support |
|-------------------------------------------------------------|----------------|---------------------------------------------------------------------------------------------------------------------------------------------|--------------------------------|
| [ACME DNS ](https://github.com/joohoi/acme-dns ) | `acme-dns` | `ACME_DNS_API_BASE` , `ACME_DNS_STORAGE_PATH` | Not tested yet |
| [Alibaba Cloud ](https://www.vultr.com ) | `alidns` | `ALICLOUD_ACCESS_KEY` , `ALICLOUD_SECRET_KEY` , `ALICLOUD_REGION_ID` | Not tested yet |
| [Auroradns ](https://www.pcextreme.com/aurora/dns ) | `auroradns` | `AURORA_USER_ID` , `AURORA_KEY` , `AURORA_ENDPOINT` | Not tested yet |
| [Azure ](https://azure.microsoft.com/services/dns/ ) | `azure` | `AZURE_CLIENT_ID` , `AZURE_CLIENT_SECRET` , `AZURE_SUBSCRIPTION_ID` , `AZURE_TENANT_ID` , `AZURE_RESOURCE_GROUP` , `[AZURE_METADATA_ENDPOINT]` | Not tested yet |
| [Blue Cat ](https://www.bluecatnetworks.com/ ) | `bluecat` | `BLUECAT_SERVER_URL` , `BLUECAT_USER_NAME` , `BLUECAT_PASSWORD` , `BLUECAT_CONFIG_NAME` , `BLUECAT_DNS_VIEW` | Not tested yet |
| [ClouDNS ](https://www.cloudns.net/ ) | `cloudns` | `CLOUDNS_AUTH_ID` , `CLOUDNS_AUTH_PASSWORD` | YES |
| [Cloudflare ](https://www.cloudflare.com ) | `cloudflare` | `CF_API_EMAIL` , `CF_API_KEY` - The `Global API Key` needs to be used, not the `Origin CA Key` | YES |
| [CloudXNS ](https://www.cloudxns.net ) | `cloudxns` | `CLOUDXNS_API_KEY` , `CLOUDXNS_SECRET_KEY` | Not tested yet |
| [ConoHa ](https://www.conoha.jp ) | `conoha` | `CONOHA_TENANT_ID` , `CONOHA_API_USERNAME` , `CONOHA_API_PASSWORD` | YES |
| [DigitalOcean ](https://www.digitalocean.com ) | `digitalocean` | `DO_AUTH_TOKEN` | YES |
| [DNSimple ](https://dnsimple.com ) | `dnsimple` | `DNSIMPLE_OAUTH_TOKEN` , `DNSIMPLE_BASE_URL` | YES |
| [DNS Made Easy ](https://dnsmadeeasy.com ) | `dnsmadeeasy` | `DNSMADEEASY_API_KEY` , `DNSMADEEASY_API_SECRET` , `DNSMADEEASY_SANDBOX` | Not tested yet |
| [DNSPod ](https://www.dnspod.com/ ) | `dnspod` | `DNSPOD_API_KEY` | Not tested yet |
| [DreamHost ](https://www.dreamhost.com/ ) | `dreamhost` | `DREAMHOST_API_KEY` | YES |
| [Duck DNS ](https://www.duckdns.org/ ) | `duckdns` | `DUCKDNS_TOKEN` | YES |
| [Dyn ](https://dyn.com ) | `dyn` | `DYN_CUSTOMER_NAME` , `DYN_USER_NAME` , `DYN_PASSWORD` | Not tested yet |
| External Program | `exec` | `EXEC_PATH` | YES |
| [Exoscale ](https://www.exoscale.com ) | `exoscale` | `EXOSCALE_API_KEY` , `EXOSCALE_API_SECRET` , `EXOSCALE_ENDPOINT` | YES |
| [Fast DNS ](https://www.akamai.com/ ) | `fastdns` | `AKAMAI_CLIENT_TOKEN` , `AKAMAI_CLIENT_SECRET` , `AKAMAI_ACCESS_TOKEN` | YES |
| [Gandi ](https://www.gandi.net ) | `gandi` | `GANDI_API_KEY` | Not tested yet |
| [Gandi v5 ](http://doc.livedns.gandi.net ) | `gandiv5` | `GANDIV5_API_KEY` | YES |
| [Glesys ](https://glesys.com/ ) | `glesys` | `GLESYS_API_USER` , `GLESYS_API_KEY` , `GLESYS_DOMAIN` | Not tested yet |
| [GoDaddy ](https://godaddy.com/domains ) | `godaddy` | `GODADDY_API_KEY` , `GODADDY_API_SECRET` | Not tested yet |
| [Google Cloud DNS ](https://cloud.google.com/dns/docs/ ) | `gcloud` | `GCE_PROJECT` , Application Default Credentials [^2] [^3], [`GCE_SERVICE_ACCOUNT_FILE`] | YES |
| [hosting.de ](https://www.hosting.de ) | `hostingde` | `HOSTINGDE_API_KEY` , `HOSTINGDE_ZONE_NAME` | Not tested yet |
| HTTP request | `httpreq` | `HTTPREQ_ENDPOINT` , `HTTPREQ_MODE` , `HTTPREQ_USERNAME` , `HTTPREQ_PASSWORD` [^1] | YES |
| [IIJ ](https://www.iij.ad.jp/ ) | `iij` | `IIJ_API_ACCESS_KEY` , `IIJ_API_SECRET_KEY` , `IIJ_DO_SERVICE_CODE` | Not tested yet |
| [INWX ](https://www.inwx.de/en ) | `inwx` | `INWX_USERNAME` , `INWX_PASSWORD` | YES |
| [Lightsail ](https://aws.amazon.com/lightsail/ ) | `lightsail` | `AWS_ACCESS_KEY_ID` , `AWS_SECRET_ACCESS_KEY` , `DNS_ZONE` | Not tested yet |
| [Linode ](https://www.linode.com ) | `linode` | `LINODE_API_KEY` | Not tested yet |
| [Linode v4 ](https://www.linode.com ) | `linodev4` | `LINODE_TOKEN` | Not tested yet |
| manual | - | none, but you need to run Traefik interactively, turn on `acmeLogging` to see instructions and press < kbd > Enter</ kbd > . | YES |
| [MyDNS.jp ](https://www.mydns.jp/ ) | `mydnsjp` | `MYDNSJP_MASTER_ID` , `MYDNSJP_PASSWORD` | YES |
| [Namecheap ](https://www.namecheap.com ) | `namecheap` | `NAMECHEAP_API_USER` , `NAMECHEAP_API_KEY` | YES |
| [name.com ](https://www.name.com/ ) | `namedotcom` | `NAMECOM_USERNAME` , `NAMECOM_API_TOKEN` , `NAMECOM_SERVER` | Not tested yet |
| [Netcup ](https://www.netcup.eu/ ) | `netcup` | `NETCUP_CUSTOMER_NUMBER` , `NETCUP_API_KEY` , `NETCUP_API_PASSWORD` | Not tested yet |
| [NIFCloud ](https://cloud.nifty.com/service/dns.htm ) | `nifcloud` | `NIFCLOUD_ACCESS_KEY_ID` , `NIFCLOUD_SECRET_ACCESS_KEY` | Not tested yet |
| [Ns1 ](https://ns1.com/ ) | `ns1` | `NS1_API_KEY` | Not tested yet |
| [Open Telekom Cloud ](https://cloud.telekom.de ) | `otc` | `OTC_DOMAIN_NAME` , `OTC_USER_NAME` , `OTC_PASSWORD` , `OTC_PROJECT_NAME` , `OTC_IDENTITY_ENDPOINT` | Not tested yet |
| [OVH ](https://www.ovh.com ) | `ovh` | `OVH_ENDPOINT` , `OVH_APPLICATION_KEY` , `OVH_APPLICATION_SECRET` , `OVH_CONSUMER_KEY` | YES |
| [Openstack Designate ](https://docs.openstack.org/designate ) | `designate` | `OS_AUTH_URL` , `OS_USERNAME` , `OS_PASSWORD` , `OS_TENANT_NAME` , `OS_REGION_NAME` | YES |
| [Oracle Cloud ](https://cloud.oracle.com/home ) | `oraclecloud` | `OCI_COMPARTMENT_OCID` , `OCI_PRIVKEY_FILE` , `OCI_PRIVKEY_PASS` , `OCI_PUBKEY_FINGERPRINT` , `OCI_REGION` , `OCI_TENANCY_OCID` , `OCI_USER_OCID` | YES |
| [PowerDNS ](https://www.powerdns.com ) | `pdns` | `PDNS_API_KEY` , `PDNS_API_URL` | Not tested yet |
| [Rackspace ](https://www.rackspace.com/cloud/dns ) | `rackspace` | `RACKSPACE_USER` , `RACKSPACE_API_KEY` | Not tested yet |
| [RFC2136 ](https://tools.ietf.org/html/rfc2136 ) | `rfc2136` | `RFC2136_TSIG_KEY` , `RFC2136_TSIG_SECRET` , `RFC2136_TSIG_ALGORITHM` , `RFC2136_NAMESERVER` | Not tested yet |
| [Route 53 ](https://aws.amazon.com/route53/ ) | `route53` | `AWS_ACCESS_KEY_ID` , `AWS_SECRET_ACCESS_KEY` , `[AWS_REGION]` , `[AWS_HOSTED_ZONE_ID]` or a configured user/instance IAM profile. | YES |
| [Sakura Cloud ](https://cloud.sakura.ad.jp/ ) | `sakuracloud` | `SAKURACLOUD_ACCESS_TOKEN` , `SAKURACLOUD_ACCESS_TOKEN_SECRET` | Not tested yet |
| [Selectel ](https://selectel.ru/en/ ) | `selectel` | `SELECTEL_API_TOKEN` | YES |
| [Stackpath ](https://www.stackpath.com/ ) | `stackpath` | `STACKPATH_CLIENT_ID` , `STACKPATH_CLIENT_SECRET` , `STACKPATH_STACK_ID` | Not tested yet |
| [TransIP ](https://www.transip.nl/ ) | `transip` | `TRANSIP_ACCOUNT_NAME` , `TRANSIP_PRIVATE_KEY_PATH` | YES |
| [VegaDNS ](https://github.com/shupp/VegaDNS-API ) | `vegadns` | `SECRET_VEGADNS_KEY` , `SECRET_VEGADNS_SECRET` , `VEGADNS_URL` | Not tested yet |
| [Vscale ](https://vscale.io/ ) | `vscale` | `VSCALE_API_TOKEN` | YES |
| [VULTR ](https://www.vultr.com ) | `vultr` | `VULTR_API_KEY` | Not tested yet |
| [Zone.ee ](https://www.zone.ee ) | `zoneee` | `ZONEEE_API_USER` , `ZONEEE_API_KEY` | YES |
[^1]: more information about the HTTP message format can be found [here ](https://go-acme.github.io/lego/dns/httpreq/ )
[^2]: [providing_credentials_to_your_application ](https://cloud.google.com/docs/authentication/production#providing_credentials_to_your_application )
[^3]: [google/default.go ](https://github.com/golang/oauth2/blob/36a7019397c4c86cf59eeab3bc0d188bac444277/google/default.go#L61-L76 )
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!!! note "`delayBeforeCheck`"
By default, the `provider` verifies the TXT record _before_ letting ACME verify.
You can delay this operation by specifying a delay (in seconds) with `delayBeforeCheck` (value must be greater than zero).
This option is useful when internal networks block external DNS queries.
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#### `resolvers`
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Use custom DNS servers to resolve the FQDN authority.
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```toml
[acme]
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# ...
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[acme.dnsChallenge]
# ...
resolvers = ["1.1.1.1:53", "8.8.8.8:53"]
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```
#### Wildcard Domains
[ACME V2 ](https://community.letsencrypt.org/t/acme-v2-and-wildcard-certificate-support-is-live/55579 ) supports wildcard certificates.
As described in [Let's Encrypt's post ](https://community.letsencrypt.org/t/staging-endpoint-for-acme-v2/49605 ) wildcard certificates can only be generated through a [`DNS-01` challenge ](#dnschallenge ).
```toml
[acme]
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# ...
[[acme.domains]]
main = "*.local1.com"
sans = ["local1.com"]
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# ...
```
!!! note "Double Wildcard Certificates"
It is not possible to request a double wildcard certificate for a domain (for example `*.*.local.com` ).
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Due to an ACME limitation it is not possible to define wildcards in SANs (alternative domains).
Thus, the wildcard domain has to be defined as a main domain.
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Most likely the root domain should receive a certificate too, so it needs to be specified as SAN and 2 `DNS-01` challenges are executed.
In this case the generated DNS TXT record for both domains is the same.
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Even though this behavior is [DNS RFC ](https://community.letsencrypt.org/t/wildcard-issuance-two-txt-records-for-the-same-name/54528/2 ) compliant,
it can lead to problems as all DNS providers keep DNS records cached for a given time (TTL) and this TTL can be greater than the challenge timeout making the `DNS-01` challenge fail.
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The Traefik ACME client library [LEGO ](https://github.com/go-acme/lego ) supports some but not all DNS providers to work around this issue.
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The [Supported `provider` table ](#providers ) indicates if they allow generating certificates for a wildcard domain and its root domain.
## Known Domains, SANs
You can set SANs (alternative domains) for each main domain.
Every domain must have A/AAAA records pointing to Traefik.
Each domain & SAN will lead to a certificate request.
```toml
[acme]
# ...
[[acme.domains]]
main = "local1.com"
sans = ["test1.local1.com", "test2.local1.com"]
[[acme.domains]]
main = "local2.com"
[[acme.domains]]
main = "*.local3.com"
sans = ["local3.com", "test1.test1.local3.com"]
# ...
```
!!! important
The certificates for the domains listed in `acme.domains` are negotiated at Traefik startup only.
!!! note
Wildcard certificates can only be verified through a `DNS-01` challenge.
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## `caServer`
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??? example "Using the Let's Encrypt staging server"
```toml
[acme]
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# ...
caServer = "https://acme-staging-v02.api.letsencrypt.org/directory"
# ...
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```
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## `onHostRule`
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Enable certificate generation on [routers ](../routing/routers/index.md ) `Host` & `HostSNI` rules.
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This will request a certificate from Let's Encrypt for each router with a Host rule.
```toml
[acme]
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# ...
onHostRule = true
# ...
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```
!!! note "Multiple Hosts in a Rule"
The rule `Host(test1.traefik.io,test2.traefik.io)` will request a certificate with the main domain `test1.traefik.io` and SAN `test2.traefik.io` .
!!! warning
`onHostRule` option can not be used to generate wildcard certificates. Refer to [wildcard generation ](#wildcard-domains ) for further information.
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## `storage`
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The `storage` option sets the location where your ACME certificates are saved to.
```toml
[acme]
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# ...
storage = "acme.json"
# ...
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```
The value can refer to two kinds of storage:
- a JSON file
- a KV store entry
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### In a File
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ACME certificates can be stored in a JSON file that needs to have a `600` file mode .
In Docker you can mount either the JSON file, or the folder containing it:
```bash
docker run -v "/my/host/acme.json:acme.json" traefik
```
```bash
docker run -v "/my/host/acme:/etc/traefik/acme" traefik
```
!!! warning
For concurrency reason, this file cannot be shared across multiple instances of Traefik. Use a key value store entry instead.
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### In a a Key Value Store Entry
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ACME certificates can be stored in a key-value store entry.
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```toml
storage = "traefik/acme/account"
```
!!! note "Storage Size"
Because key-value stores have limited entry size, the certificates list is compressed _before_ it is saved.
For example, it is possible to store up to _approximately_ 100 ACME certificates in Consul.
## Fallbacks
If Let's Encrypt is not reachable, the following certificates will apply:
1. Previously generated ACME certificates (before downtime)
1. Expired ACME certificates
1. Provided certificates
!!! note
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For new (sub)domains which need Let's Encrypt authentication, the default Traefik certificate will be used until Traefik is restarted.
