348 lines
26 KiB
Markdown
348 lines
26 KiB
Markdown
# ACME
|
|
|
|
Automatic HTTPS
|
|
{: .subtitle }
|
|
|
|
You can configure Traefik to use an ACME provider (like Let's Encrypt) for automatic certificate generation.
|
|
|
|
!!! warning "Let's Encrypt and Rate Limiting"
|
|
Note that Let's Encrypt API has [rate limiting](https://letsencrypt.org/docs/rate-limits).
|
|
|
|
## Configuration Examples
|
|
|
|
??? example "Enabling ACME"
|
|
|
|
```toml
|
|
[entryPoints]
|
|
[entryPoints.web]
|
|
address = ":80"
|
|
|
|
[entryPoints.http-tls]
|
|
address = ":443"
|
|
|
|
[acme] # every router with TLS enabled will now be able to use ACME for its certificates
|
|
email = "your-email@your-domain.org"
|
|
storage = "acme.json"
|
|
onHostRule = true # dynamic generation based on the Host() & HostSNI() matchers
|
|
[acme.httpChallenge]
|
|
entryPoint = "web" # used during the challenge
|
|
```
|
|
|
|
??? example "Configuring Wildcard Certificates"
|
|
|
|
```toml
|
|
[entryPoints]
|
|
[entryPoints.web]
|
|
address = ":80"
|
|
|
|
[entryPoints.http-tls]
|
|
address = ":443"
|
|
|
|
[acme]
|
|
email = "your-email@your-domain.org"
|
|
storage = "acme.json"
|
|
[acme.dnsChallenge]
|
|
provider = "xxx"
|
|
|
|
[[acme.domains]]
|
|
main = "*.mydomain.com"
|
|
sans = ["mydomain.com"]
|
|
```
|
|
|
|
??? note "Configuration Reference"
|
|
|
|
There are many available options for ACME. For a quick glance at what's possible, browse the configuration reference:
|
|
|
|
```toml
|
|
--8<-- "content/https-tls/ref-acme.toml"
|
|
```
|
|
|
|
## Automatic Renewals
|
|
|
|
Traefik automatically tracks the expiry date of ACME certificates it generates.
|
|
|
|
If there are less than 30 days remaining before the certificate expires, Traefik will attempt to rewnew it automatically.
|
|
|
|
!!! note
|
|
Certificates that are no longer used may still be renewed, as Traefik does not currently check if the certificate is being used before renewing.
|
|
|
|
## The Different ACME Challenges
|
|
|
|
### `tlsChallenge`
|
|
|
|
Use the `TLS-ALPN-01` challenge to generate and renew ACME certificates by provisioning a TLS certificate.
|
|
|
|
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.
|
|
|
|
??? example "Configuring the `tlsChallenge`"
|
|
|
|
```toml
|
|
[acme]
|
|
[acme.tlsChallenge]
|
|
```
|
|
|
|
### `httpChallenge`
|
|
|
|
Use the `HTTP-01` challenge to generate and renew ACME certificates by provisioning an HTTP resource under a well-known URI.
|
|
|
|
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.
|
|
|
|
??? example "Using an EntryPoint Called http for the `httpChallenge`"
|
|
|
|
```toml
|
|
[acme]
|
|
# ...
|
|
[acme.httpChallenge]
|
|
entryPoint = "http"
|
|
```
|
|
|
|
!!! note
|
|
Redirection is fully compatible with the `HTTP-01` challenge.
|
|
|
|
### `dnsChallenge`
|
|
|
|
Use the `DNS-01` challenge to generate and renew ACME certificates by provisioning a DNS record.
|
|
|
|
??? example "Configuring a `dnsChallenge` with the DigitalOcean Provider"
|
|
|
|
```toml
|
|
[acme]
|
|
# ...
|
|
[acme.dnsChallenge]
|
|
provider = "digitalocean"
|
|
delayBeforeCheck = 0
|
|
# ...
|
|
```
|
|
|
|
!!! important
|
|
A `provider` is mandatory.
|
|
|
|
#### `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).
|
|
Do not hesitate to complete it.
|
|
|
|
Every lego environment variable can be overridden by their respective `_FILE` counterpart, which should have a filepath to a file that contains the secret as its value.
|
|
For example, `CF_API_EMAIL_FILE=/run/secrets/traefik_cf-api-email` could be used to provide a Cloudflare API email address as a Docker secret named `traefik_cf-api-email`.
|
|
|
|
| Provider Name | Provider Code | Environment Variables | |
|
|
|-------------------------------------------------------------|----------------|---------------------------------------------------------------------------------------------------------------------------------------------|-----------------------------------------------------------------------------|
|
|
| [ACME DNS](https://github.com/joohoi/acme-dns) | `acme-dns` | `ACME_DNS_API_BASE`, `ACME_DNS_STORAGE_PATH` | [Additional configuration](https://go-acme.github.io/lego/dns/acme-dns) |
|
|
| [Alibaba Cloud](https://www.vultr.com) | `alidns` | `ALICLOUD_ACCESS_KEY`, `ALICLOUD_SECRET_KEY`, `ALICLOUD_REGION_ID` | [Additional configuration](https://go-acme.github.io/lego/dns/alidns) |
|
|
| [Auroradns](https://www.pcextreme.com/aurora/dns) | `auroradns` | `AURORA_USER_ID`, `AURORA_KEY`, `AURORA_ENDPOINT` | [Additional configuration](https://go-acme.github.io/lego/dns/auroradns) |
|
|
| [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]` | [Additional configuration](https://go-acme.github.io/lego/dns/azure) |
|
|
| [Blue Cat](https://www.bluecatnetworks.com/) | `bluecat` | `BLUECAT_SERVER_URL`, `BLUECAT_USER_NAME`, `BLUECAT_PASSWORD`, `BLUECAT_CONFIG_NAME`, `BLUECAT_DNS_VIEW` | [Additional configuration](https://go-acme.github.io/lego/dns/bluecat) |
|
|
| [ClouDNS](https://www.cloudns.net/) | `cloudns` | `CLOUDNS_AUTH_ID`, `CLOUDNS_AUTH_PASSWORD` | [Additional configuration](https://go-acme.github.io/lego/dns/cloudns) |
|
|
| [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` | [Additional configuration](https://go-acme.github.io/lego/dns/cloudflare) |
|
|
| [CloudXNS](https://www.cloudxns.net) | `cloudxns` | `CLOUDXNS_API_KEY`, `CLOUDXNS_SECRET_KEY` | [Additional configuration](https://go-acme.github.io/lego/dns/cloudxns) |
|
|
| [ConoHa](https://www.conoha.jp) | `conoha` | `CONOHA_TENANT_ID`, `CONOHA_API_USERNAME`, `CONOHA_API_PASSWORD` | [Additional configuration](https://go-acme.github.io/lego/dns/conoha) |
|
|
| [DigitalOcean](https://www.digitalocean.com) | `digitalocean` | `DO_AUTH_TOKEN` | [Additional configuration](https://go-acme.github.io/lego/dns/digitalocean) |
|
|
| [DNSimple](https://dnsimple.com) | `dnsimple` | `DNSIMPLE_OAUTH_TOKEN`, `DNSIMPLE_BASE_URL` | [Additional configuration](https://go-acme.github.io/lego/dns/dnsimple) |
|
|
| [DNS Made Easy](https://dnsmadeeasy.com) | `dnsmadeeasy` | `DNSMADEEASY_API_KEY`, `DNSMADEEASY_API_SECRET`, `DNSMADEEASY_SANDBOX` | [Additional configuration](https://go-acme.github.io/lego/dns/dnsmadeeasy) |
|
|
| [DNSPod](https://www.dnspod.com/) | `dnspod` | `DNSPOD_API_KEY` | [Additional configuration](https://go-acme.github.io/lego/dns/dnspod) |
|
|
| [Domain Offensive (do.de)](https://www.do.de/) | `dode` | `DODE_TOKEN` | [Additional configuration](https://go-acme.github.io/lego/dns/dode) |
|
|
| [DreamHost](https://www.dreamhost.com/) | `dreamhost` | `DREAMHOST_API_KEY` | [Additional configuration](https://go-acme.github.io/lego/dns/dreamhost) |
|
|
| [Duck DNS](https://www.duckdns.org/) | `duckdns` | `DUCKDNS_TOKEN` | [Additional configuration](https://go-acme.github.io/lego/dns/duckdns) |
|
|
| [Dyn](https://dyn.com) | `dyn` | `DYN_CUSTOMER_NAME`, `DYN_USER_NAME`, `DYN_PASSWORD` | [Additional configuration](https://go-acme.github.io/lego/dns/dyn) |
|
|
| External Program | `exec` | `EXEC_PATH` | [Additional configuration](https://go-acme.github.io/lego/dns/exec) |
|
|
| [Exoscale](https://www.exoscale.com) | `exoscale` | `EXOSCALE_API_KEY`, `EXOSCALE_API_SECRET`, `EXOSCALE_ENDPOINT` | [Additional configuration](https://go-acme.github.io/lego/dns/exoscale) |
|
|
| [Fast DNS](https://www.akamai.com/) | `fastdns` | `AKAMAI_CLIENT_TOKEN`, `AKAMAI_CLIENT_SECRET`, `AKAMAI_ACCESS_TOKEN` | [Additional configuration](https://go-acme.github.io/lego/dns/fastdns) |
|
|
| [Gandi](https://www.gandi.net) | `gandi` | `GANDI_API_KEY` | [Additional configuration](https://go-acme.github.io/lego/dns/gandi) |
|
|
| [Gandi v5](http://doc.livedns.gandi.net) | `gandiv5` | `GANDIV5_API_KEY` | [Additional configuration](https://go-acme.github.io/lego/dns/gandiv5) |
|
|
| [Glesys](https://glesys.com/) | `glesys` | `GLESYS_API_USER`, `GLESYS_API_KEY`, `GLESYS_DOMAIN` | [Additional configuration](https://go-acme.github.io/lego/dns/glesys) |
|
|
| [GoDaddy](https://godaddy.com/) | `godaddy` | `GODADDY_API_KEY`, `GODADDY_API_SECRET` | [Additional configuration](https://go-acme.github.io/lego/dns/godaddy) |
|
|
| [Google Cloud DNS](https://cloud.google.com/dns/docs/) | `gcloud` | `GCE_PROJECT`, Application Default Credentials [^2] [^3], [`GCE_SERVICE_ACCOUNT_FILE`] | [Additional configuration](https://go-acme.github.io/lego/dns/gcloud) |
|
|
| [hosting.de](https://www.hosting.de) | `hostingde` | `HOSTINGDE_API_KEY`, `HOSTINGDE_ZONE_NAME` | [Additional configuration](https://go-acme.github.io/lego/dns/hostingde) |
|
|
| HTTP request | `httpreq` | `HTTPREQ_ENDPOINT`, `HTTPREQ_MODE`, `HTTPREQ_USERNAME`, `HTTPREQ_PASSWORD` [^1] | [Additional configuration](https://go-acme.github.io/lego/dns/httpreq) |
|
|
| [IIJ](https://www.iij.ad.jp/) | `iij` | `IIJ_API_ACCESS_KEY`, `IIJ_API_SECRET_KEY`, `IIJ_DO_SERVICE_CODE` | [Additional configuration](https://go-acme.github.io/lego/dns/iij) |
|
|
| [INWX](https://www.inwx.de/en) | `inwx` | `INWX_USERNAME`, `INWX_PASSWORD` | [Additional configuration](https://go-acme.github.io/lego/dns/inwx) |
|
|
| [Lightsail](https://aws.amazon.com/lightsail/) | `lightsail` | `AWS_ACCESS_KEY_ID`, `AWS_SECRET_ACCESS_KEY`, `DNS_ZONE` | [Additional configuration](https://go-acme.github.io/lego/dns/lightsail) |
|
|
| [Linode](https://www.linode.com) | `linode` | `LINODE_API_KEY` | [Additional configuration](https://go-acme.github.io/lego/dns/linode) |
|
|
| [Linode v4](https://www.linode.com) | `linodev4` | `LINODE_TOKEN` | [Additional configuration](https://go-acme.github.io/lego/dns/linodev4) |
|
|
| manual | - | none, but you need to run Traefik interactively [^4], turn on `acmeLogging` to see instructions and press <kbd>Enter</kbd>. | |
|
|
| [MyDNS.jp](https://www.mydns.jp/) | `mydnsjp` | `MYDNSJP_MASTER_ID`, `MYDNSJP_PASSWORD` | [Additional configuration](https://go-acme.github.io/lego/dns/mydnsjp) |
|
|
| [Namecheap](https://www.namecheap.com) | `namecheap` | `NAMECHEAP_API_USER`, `NAMECHEAP_API_KEY` | [Additional configuration](https://go-acme.github.io/lego/dns/namecheap) |
|
|
| [name.com](https://www.name.com/) | `namedotcom` | `NAMECOM_USERNAME`, `NAMECOM_API_TOKEN`, `NAMECOM_SERVER` | [Additional configuration](https://go-acme.github.io/lego/dns/namedotcom) |
|
|
| [Netcup](https://www.netcup.eu/) | `netcup` | `NETCUP_CUSTOMER_NUMBER`, `NETCUP_API_KEY`, `NETCUP_API_PASSWORD` | [Additional configuration](https://go-acme.github.io/lego/dns/netcup) |
|
|
| [NIFCloud](https://cloud.nifty.com/service/dns.htm) | `nifcloud` | `NIFCLOUD_ACCESS_KEY_ID`, `NIFCLOUD_SECRET_ACCESS_KEY` | [Additional configuration](https://go-acme.github.io/lego/dns/nifcloud) |
|
|
| [Ns1](https://ns1.com/) | `ns1` | `NS1_API_KEY` | [Additional configuration](https://go-acme.github.io/lego/dns/ns1) |
|
|
| [Open Telekom Cloud](https://cloud.telekom.de) | `otc` | `OTC_DOMAIN_NAME`, `OTC_USER_NAME`, `OTC_PASSWORD`, `OTC_PROJECT_NAME`, `OTC_IDENTITY_ENDPOINT` | [Additional configuration](https://go-acme.github.io/lego/dns/otc) |
|
|
| [OVH](https://www.ovh.com) | `ovh` | `OVH_ENDPOINT`, `OVH_APPLICATION_KEY`, `OVH_APPLICATION_SECRET`, `OVH_CONSUMER_KEY` | [Additional configuration](https://go-acme.github.io/lego/dns/ovh) |
|
|
| [Openstack Designate](https://docs.openstack.org/designate) | `designate` | `OS_AUTH_URL`, `OS_USERNAME`, `OS_PASSWORD`, `OS_TENANT_NAME`, `OS_REGION_NAME` | [Additional configuration](https://go-acme.github.io/lego/dns/designate) |
|
|
| [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` | [Additional configuration](https://go-acme.github.io/lego/dns/oraclecloud) |
|
|
| [PowerDNS](https://www.powerdns.com) | `pdns` | `PDNS_API_KEY`, `PDNS_API_URL` | [Additional configuration](https://go-acme.github.io/lego/dns/pdns) |
|
|
| [Rackspace](https://www.rackspace.com/cloud/dns) | `rackspace` | `RACKSPACE_USER`, `RACKSPACE_API_KEY` | [Additional configuration](https://go-acme.github.io/lego/dns/rackspace) |
|
|
| [RFC2136](https://tools.ietf.org/html/rfc2136) | `rfc2136` | `RFC2136_TSIG_KEY`, `RFC2136_TSIG_SECRET`, `RFC2136_TSIG_ALGORITHM`, `RFC2136_NAMESERVER` | [Additional configuration](https://go-acme.github.io/lego/dns/rfc2136) |
|
|
| [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. | [Additional configuration](https://go-acme.github.io/lego/dns/route53) |
|
|
| [Sakura Cloud](https://cloud.sakura.ad.jp/) | `sakuracloud` | `SAKURACLOUD_ACCESS_TOKEN`, `SAKURACLOUD_ACCESS_TOKEN_SECRET` | [Additional configuration](https://go-acme.github.io/lego/dns/sakuracloud) |
|
|
| [Selectel](https://selectel.ru/en/) | `selectel` | `SELECTEL_API_TOKEN` | [Additional configuration](https://go-acme.github.io/lego/dns/selectel) |
|
|
| [Stackpath](https://www.stackpath.com/) | `stackpath` | `STACKPATH_CLIENT_ID`, `STACKPATH_CLIENT_SECRET`, `STACKPATH_STACK_ID` | [Additional configuration](https://go-acme.github.io/lego/dns/stackpath) |
|
|
| [TransIP](https://www.transip.nl/) | `transip` | `TRANSIP_ACCOUNT_NAME`, `TRANSIP_PRIVATE_KEY_PATH` | [Additional configuration](https://go-acme.github.io/lego/dns/transip) |
|
|
| [VegaDNS](https://github.com/shupp/VegaDNS-API) | `vegadns` | `SECRET_VEGADNS_KEY`, `SECRET_VEGADNS_SECRET`, `VEGADNS_URL` | [Additional configuration](https://go-acme.github.io/lego/dns/vegadns) |
|
|
| [Vscale](https://vscale.io/) | `vscale` | `VSCALE_API_TOKEN` | [Additional configuration](https://go-acme.github.io/lego/dns/vscale) |
|
|
| [VULTR](https://www.vultr.com) | `vultr` | `VULTR_API_KEY` | [Additional configuration](https://go-acme.github.io/lego/dns/vultr) |
|
|
| [Zone.ee](https://www.zone.ee) | `zoneee` | `ZONEEE_API_USER`, `ZONEEE_API_KEY` | [Additional configuration](https://go-acme.github.io/lego/dns/zoneee) |
|
|
|
|
[^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)
|
|
[^4]: `docker stack` remark: there is no way to support terminal attached to container when deploying with `docker stack`, so you might need to run container with `docker run -it` to generate certificates using `manual` provider.
|
|
|
|
!!! 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.
|
|
|
|
#### `resolvers`
|
|
|
|
Use custom DNS servers to resolve the FQDN authority.
|
|
|
|
```toml
|
|
[acme]
|
|
# ...
|
|
[acme.dnsChallenge]
|
|
# ...
|
|
resolvers = ["1.1.1.1:53", "8.8.8.8:53"]
|
|
```
|
|
|
|
#### 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]
|
|
# ...
|
|
[[acme.domains]]
|
|
main = "*.local1.com"
|
|
sans = ["local1.com"]
|
|
|
|
# ...
|
|
```
|
|
|
|
!!! note "Double Wildcard Certificates"
|
|
It is not possible to request a double wildcard certificate for a domain (for example `*.*.local.com`).
|
|
|
|
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.
|
|
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.
|
|
|
|
The Traefik ACME client library [LEGO](https://github.com/go-acme/lego) supports some but not all DNS providers to work around this issue.
|
|
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.
|
|
|
|
## `caServer`
|
|
|
|
??? example "Using the Let's Encrypt staging server"
|
|
|
|
```toml
|
|
[acme]
|
|
# ...
|
|
caServer = "https://acme-staging-v02.api.letsencrypt.org/directory"
|
|
# ...
|
|
```
|
|
|
|
## `onHostRule`
|
|
|
|
Enable certificate generation on [routers](../routing/routers/index.md) `Host` & `HostSNI` rules.
|
|
|
|
This will request a certificate from Let's Encrypt for each router with a Host rule.
|
|
|
|
```toml
|
|
[acme]
|
|
# ...
|
|
onHostRule = true
|
|
# ...
|
|
```
|
|
|
|
!!! 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.
|
|
|
|
## `storage`
|
|
|
|
The `storage` option sets the location where your ACME certificates are saved to.
|
|
|
|
```toml
|
|
[acme]
|
|
# ...
|
|
storage = "acme.json"
|
|
# ...
|
|
```
|
|
|
|
The value can refer to two kinds of storage:
|
|
|
|
- a JSON file
|
|
- a KV store entry
|
|
|
|
### In a File
|
|
|
|
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.
|
|
|
|
### In a a Key Value Store Entry
|
|
|
|
ACME certificates can be stored in a key-value store entry.
|
|
|
|
```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.
|
|
|
|
## Fallback
|
|
|
|
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
|
|
For new (sub)domains which need Let's Encrypt authentication, the default Traefik certificate will be used until Traefik is restarted.
|