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--- ---
title: "Tailscale golink: Private Shortlinks for your Tailnet" # Title of the blog post. title: "Tailscale golink: Private Shortlinks for your Tailnet" # Title of the blog post.
date: 2023-01-08T13:51:42-06:00 # Date of post creation. date: 2023-02-12
# lastmod: 2023-01-08T13:51:42-06:00 # Date when last modified # lastmod: 2023-01-08T13:51:42-06:00 # Date when last modified
description: "How to deploy Tailscale's golink service in a Docker container." description: "How to deploy Tailscale's golink service in a Docker container."
featured: false # Sets if post is a featured post, making appear on the home page side bar. featured: false # Sets if post is a featured post, making appear on the home page side bar.
@ -11,7 +11,7 @@ usePageBundles: true
# featureImage: "file.png" # Sets featured image on blog post. # featureImage: "file.png" # Sets featured image on blog post.
# featureImageAlt: 'Description of image' # Alternative text for featured image. # featureImageAlt: 'Description of image' # Alternative text for featured image.
# featureImageCap: 'This is the featured image.' # Caption (optional). # featureImageCap: 'This is the featured image.' # Caption (optional).
# thumbnail: "thumbnail.png" # Sets thumbnail image appearing inside card on homepage. thumbnail: "golinks.png" # Sets thumbnail image appearing inside card on homepage.
# shareImage: "share.png" # Designate a separate image for social media sharing. # shareImage: "share.png" # Designate a separate image for social media sharing.
codeLineNumbers: false # Override global value for showing of line numbers within code block. codeLineNumbers: false # Override global value for showing of line numbers within code block.
series: Tips # Projects, Scripts, vRA8, K8s on vSphere series: Tips # Projects, Scripts, vRA8, K8s on vSphere
@ -23,16 +23,16 @@ tags:
- containers - containers
comment: true # Disable comment if false. comment: true # Disable comment if false.
--- ---
I've shared in the past about how I use [custom search engines in Chrome](/abusing-chromes-custom-search-engines-for-fun-and-profit/) as quick web shortcuts. And I may have mentioned [my love for Tailscale](/tags/tailscale/) a time or two as well. Well I recently learned of a way to combine these two passions: [Tailscale golink](https://github.com/tailscale/golink). The [golink announcement poston the Tailscale blog](https://tailscale.com/blog/golink/) offers a great overview of the service: I've shared in the past about how I use [custom search engines in Chrome](/abusing-chromes-custom-search-engines-for-fun-and-profit/) as quick web shortcuts. And I may have mentioned [my love for Tailscale](/tags/tailscale/) a time or two as well. Well I recently learned of a way to combine these two passions: [Tailscale golink](https://github.com/tailscale/golink). The [golink announcement post on the Tailscale blog](https://tailscale.com/blog/golink/) offers a great overview of the service:
> Using golink, you can create and share simple go/name links for commonly accessed websites, so that anyone in your network can access them no matter the device they’re on — without requiring browser extensions or fiddling with DNS settings. And because golink integrates with Tailscale, links are private to users in your tailnet without any separate user management, logins, or security policies. > Using golink, you can create and share simple go/name links for commonly accessed websites, so that anyone in your network can access them no matter the device they’re on — without requiring browser extensions or fiddling with DNS settings. And because golink integrates with Tailscale, links are private to users in your tailnet without any separate user management, logins, or security policies.
And these go links don't have to be simply static shortcuts; the system is able to leverage go templates to conditionally insert text into the target URL - similar to my custom search engine setup. The Tailscale blog also has some clever suggestions on how to use this capability. And these go links don't have to be simply static shortcuts either; they can also conditionally insert text into the target URL - similar to my custom search engine setup. The Tailscale blog also has some clever suggestions on how to use this capability.
Sounds great - but how do you actually make golink available on your tailnet? Well, here's what I did to deploy the [golink Docker image](https://github.com/tailscale/golink/pkgs/container/golink) on a [Photon OS VM I set up running on my Quartz64 running ESXi-ARM](/esxi-arm-on-quartz64/#workload-creation). Sounds great - but how do you actually make golink available on your tailnet? Well, here's what I did to deploy the [golink Docker image](https://github.com/tailscale/golink/pkgs/container/golink) on a [Photon OS VM I set up running on my Quartz64 running ESXi-ARM](/esxi-arm-on-quartz64/#workload-creation).
## Tailnet prep ### Tailnet prep
There are three things I'll need to do in the Tailscale admin portal before moving on. There are three things I'll need to do in the Tailscale admin portal before moving on:
### Create an ACL tag #### Create an ACL tag
I assign ACL tags to devices in my tailnet based on their location and/or purpose, and I'm then able to use those in a policy to restrict access between certain devices. To that end, I'm going to create a new `tag:golink` tag for this purpose. Creating a new tag in Tailscale is really just going to the [Access Controls page of the admin console](https://login.tailscale.com/admin/acls) and editing the policy to specify a `tagOwner` who is permitted to assign the tag: I assign ACL tags to devices in my tailnet based on their location and/or purpose, and I'm then able to use those in a policy to restrict access between certain devices. To that end, I'm going to create a new `tag:golink` tag for this purpose. Creating a new tag in Tailscale is really just going to the [Access Controls page of the admin console](https://login.tailscale.com/admin/acls) and editing the policy to specify a `tagOwner` who is permitted to assign the tag:
```text {hl_lines=[11]} ```text {hl_lines=[11]}
"groups": "groups":
@ -49,7 +49,7 @@ I assign ACL tags to devices in my tailnet based on their location and/or purpos
}, },
``` ```
### Configure ACL access #### Configure ACL access
This step is really only necessary since I've altered the default Tailscale ACL and prevent my nodes from communicating with each other unless specifically permitted. I want to make sure that everything on my tailnet can access golink: This step is really only necessary since I've altered the default Tailscale ACL and prevent my nodes from communicating with each other unless specifically permitted. I want to make sure that everything on my tailnet can access golink:
```text ```text
@ -66,8 +66,8 @@ This step is really only necessary since I've altered the default Tailscale ACL
], ],
``` ```
### Create an auth key #### Create an auth key
The last prerequisite task is to create a new authentication key that the golink container can use to log in to Tailscale since I won't be running `tailscale` interactively. This can easily be done from the [Settings page](https://login.tailscale.com/admin/settings/keys). I'll go ahead and set the key to expire in 1 day (since I'm going to use it in just a moment), make sure that the Epheral option is _disabled_ (since I don't want the new node to lose its authorization once it disconnects), and associate it with my new `tag:golink` tag. The last prerequisite task is to create a new authentication key that the golink container can use to log in to Tailscale since I won't be running `tailscale` interactively. This can easily be done from the [Settings page](https://login.tailscale.com/admin/settings/keys). I'll go ahead and set the key to expire in 1 day (since I'm going to use it in just a moment), make sure that the Ephemeral option is _disabled_ (since I don't want the new node to lose its authorization once it disconnects), and associate it with my new `tag:golink` tag.
![Creating a new auth key](create_auth_key.png) ![Creating a new auth key](create_auth_key.png)
@ -76,7 +76,7 @@ Applying that tag does two things for me: (1) it makes it easy to manage access
After clicking the **Generate key** button, the key will be displayed. This is the only time it will be visible so be sure to copy it somewhere safe! After clicking the **Generate key** button, the key will be displayed. This is the only time it will be visible so be sure to copy it somewhere safe!
## Docker setup ### Docker setup
The [golink repo](https://github.com/tailscale/golink) offers this command for running the container: The [golink repo](https://github.com/tailscale/golink) offers this command for running the container:
```shell ```shell
docker run -it --rm ghcr.io/tailscale/golink:main docker run -it --rm ghcr.io/tailscale/golink:main
@ -87,7 +87,7 @@ The doc also indicates that I can pass the auth key to the golink service via th
```shell ```shell
mkdir -p golink/data mkdir -p golink/data
cd golink cd golink
chmod 65536:65563 data chmod 65532:65532 data
vi docker-compose.yaml vi docker-compose.yaml
``` ```
@ -106,13 +106,16 @@ services:
``` ```
I can then start the container with `sudo docker-compose up -d`, and check the Tailscale admin console to see that the new machine was registered successfully: I can then start the container with `sudo docker-compose up -d`, and check the Tailscale admin console to see that the new machine was registered successfully:
![Newly registered machine](registed_machine.png) ![Newly registered machine](registered_machine.png)
And I can point a web browser to `go/` and see the (currently-empty) landing page: And I can point a web browser to `go/` and see the (currently-empty) landing page:
![Empty go page](empty_go_page.png) ![Empty go page](empty_go_page.png)
{{% notice tip "Security cleanup!" %}}
The `TS_AUTHKEY` is only needed for this initial authentication; now that the container is connected to my Tailnet I can remove that line from the `docker-compose.yaml` file to avoid having a sensitive credential hanging around. Future (re)starts of the container will use the token stored in the golink database.
{{% /notice %}}
## Get go'ing ### Get go'ing
Getting started with golink is pretty simple - just enter a shortname and a destination: Getting started with golink is pretty simple - just enter a shortname and a destination:
![Creating a new link](create_new_link.png) ![Creating a new link](create_new_link.png)
@ -129,17 +132,22 @@ Some of my other golinks:
| Shortlink | Destination URL | Description | | Shortlink | Destination URL | Description |
| --- | --- | --- | | --- | --- | --- |
| `cs` | `https://github.com/search?type=code&q=user:jbowdre+{{with .Path}}+{{.}}{{end}}` | searches my code on Github | | `code` | `https://github.com/search?type=code&q=user:jbowdre{{with .Path}}+{{.}}{{end}}` | searches my code on Github |
| `ipam` | `https://ipam.lab.bowdre.net/{{with .Path}}tools/search/{{.}}{{end}}` | searches my phpIPAM instance | | `ipam` | `https://ipam.lab.bowdre.net/{{with .Path}}tools/search/{{.}}{{end}}` | searches my lab phpIPAM instance |
| `pdb` | `https://www.protondb.com/{{with .Path}}search?q={{.}}{{end}}` | searches [protondb](https://www.protondb.com/), super-handy for checking game compatibility when [Tailscale is installed on a Steam Deck](https://tailscale.com/blog/steam-deck/) |
| `tailnet` | `https://login.tailscale.com/admin/machines?q={{.Path}}` | searches my Tailscale admin panel for a machine name |
| `vpot8` | `https://www.virtuallypotato.com/{{with .Path}}search?query={{.}}{{end}}` | searches this here site |
| `sho` | `https://www.shodan.io/{{with .Path}}search?query={{.}}{{end}}` | searches Shodan for interesting internet-connected systems |
| `tools` | `https://neeva.com/spaces/m_Bhx8tPfYQbOmaW1UHz-3a_xg3h2amlogo2GzgD` | shortcut to my [Tech Toolkit space](https://neeva.com/spaces/m_Bhx8tPfYQbOmaW1UHz-3a_xg3h2amlogo2GzgD) on Neeva |
## Back up and restore #### Back up and restore
You can browse to `go/.export` to see a JSON-formatted listing of all configured shortcuts - or, if you're clever, you could do something like `curl http://go/.export -o links.json` to download a copy. You can browse to `go/.export` to see a JSON-formatted listing of all configured shortcuts - or, if you're clever, you could do something like `curl http://go/.export -o links.json` to download a copy.
To restore, just pass `--snapshot /path/to/links.json` when starting golink. What I usually do is copy the file into the `data` folder that I'm mounting as a Docker volume, and then just run: To restore, just pass `--snapshot /path/to/links.json` when starting golink. What I usually do is copy the file into the `data` folder that I'm mounting as a Docker volume, and then just run:
```shell ```shell
sudo docker exec -it golink /golink --sqlitedb /home/nonroot/golink.db --snapshot /home/nonroot/links.json sudo docker exec golink /golink --sqlitedb /home/nonroot/golink.db --snapshot /home/nonroot/links.json
``` ```
### Conclusion
This little golink utility has been pretty handy on my Tailnet so far. It seems so simple, but I'm really impressed by how well it works. If you happen to try it out, I'd love to hear how you're putting it to use.