159 lines
5.5 KiB
Markdown
159 lines
5.5 KiB
Markdown
# Overall architecture
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## Configuring the OS
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This repo contains a bunch of scripts to configure NixOS on all cluster nodes.
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Most scripts are invoked with the following syntax:
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- for scripts that generate secrets: `./gen_<something> <cluster_name>` to generate the secrets to be used on cluster `<cluster_name>`
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- for deployment scripts:
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- `./deploy_<something> <cluster_name>` to run the deployment script on all nodes of the cluster `<cluster_name>`
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- `./deploy_<something> <cluster_name> <node1> <node2> ...` to run the deployment script only on nodes `node1, node2, ...` of cluster `<cluster_name>`.
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All deployment scripts can use the following parameters passed as environment variables:
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- `SUDO_PASS`: optionnally, the password for `sudo` on cluster nodes. If not set, it will be asked at the begninning.
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- `SSH_USER`: optionnally, the user to try to login using SSH. If not set, the username from your local machine will be used.
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### Assumptions (how to setup your environment)
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- you have an SSH access to all of your cluster nodes (listed in `cluster/<cluster_name>/ssh_config`)
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- your account is in group `wheel` and you know its password (you need it to become root using `sudo`);
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the password is the same on all cluster nodes (see below for password management tools)
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- you have a clone of the secrets repository in your `pass` password store, for instance at `~/.password-store/deuxfleurs`
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(scripts in this repo will read and write all secrets in `pass` under `deuxfleurs/cluster/<cluster_name>/`)
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### Deploying the NixOS configuration
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The NixOS configuration makes use of a certain number of files:
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- files in `nix/` that are the same for all deployments on all clusters
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- the file `cluster/<cluster_name>/cluster.nix`, a Nix configuration file that is specific to the cluster but is copied the same on all cluster nodes
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- files in `cluster/<cluster_name>/site/`, which are specific to the various sites on which Nix nodes are deployed
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- files in `cluster/<cluster_name>/node/` which are specific to each node
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To deploy the NixOS configuration on the cluster, simply do:
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```
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./deploy_nixos <cluster_name>
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```
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or to deploy only on a single node:
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```
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./deploy_nixos <cluster_name> <node_name>
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```
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To upgrade NixOS, use the `./upgrade_nixos` script instead (it has the same syntax).
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### Generating and deploying a PKI for Consul and Nomad
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First, if the PKI has not yet been created, create it with:
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```
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./gen_pki <cluster_name>
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```
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Then, deploy the PKI on all nodes with:
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```
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./deploy_pki <cluster_name>
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```
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Note that certificates are valid for not much more than one year: every year in January, `gen_pki` and `deploy_pki` have to be re-run to generate certificates for the new year.
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### Adding administrators and password management
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Adminstrators are defined in the `cluster.nix` file for each cluster (they could also be defined in the site-specific Nix files if necessary).
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This is where their public SSH keys for remote access are put.
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Administrators will also need passwords to administrate the cluster, as we are not using passwordless sudo.
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To set the password for a new administrator, they must have a working `pass` installation as specified above.
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They must then run:
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```
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./passwd <cluster_name> <user_name>
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```
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to set their password in the `pass` database (the password is hashed, so other administrators cannot learn their password even if they have access to the `pass` db).
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Then, an administrator that already has root access must run the following (after syncing the `pass` db) to set the password correctly on all cluster nodes:
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```
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./deploy_passwords <cluster_name>
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```
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## Deploying stuff on Nomad
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### Connecting to Nomad
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Connect using SSH to one of the cluster nodes, forwarding port 14646 to port 4646 on localhost, and port 8501 to port 8501 on localhost.
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You can for instance use an entry in your `~/.ssh/config` that looks like this:
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```
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Host caribou
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HostName 2a01:e0a:c:a720::23
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LocalForward 14646 127.0.0.1:4646
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LocalForward 8501 127.0.0.1:8501
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LocalForward 1389 bottin.service.staging.consul:389
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```
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Then, in a separate window, launch `./tlsproxy <cluster_name>`: this will
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launch `socat` proxies that strip the TLS layer and allow you to simply access
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Nomad and Consul on the regular, unencrypted URLs: `http://localhost:4646` for
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Nomad and `http://localhost:8500` for Consul. Keep this terminal window for as
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long as you need to access Nomad and Consul on the cluster.
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### Setting scheduler config
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Some configuration options have to be tweaked in the orchestrator. Use `nomad orchestrator scheduler set-config` to obtain the following result:
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```bash
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$ nomad operator scheduler get-config --json
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{
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"KnownLeader": true,
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"LastContact": 0,
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"LastIndex": 0,
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"NextToken": "",
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"RequestTime": 0,
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"SchedulerConfig": {
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"CreateIndex": 5,
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"MemoryOversubscriptionEnabled": true, # << THIS
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"ModifyIndex": 399239,
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"PauseEvalBroker": false,
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"PreemptionConfig": {
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"BatchSchedulerEnabled": true, # << THIS
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"ServiceSchedulerEnabled": true, # << THIS
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"SysBatchSchedulerEnabled": true # << THIS
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"SystemSchedulerEnabled": true # << THIS
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},
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"RejectJobRegistration": false,
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"SchedulerAlgorithm": "binpack"
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}
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}
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```
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### Launching services
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Stuff should be started in this order:
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1. `app/core`
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2. `app/frontend`
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3. `app/telemetry`
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4. `app/garage`
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5. `app/directory`
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Then, other stuff can be started in any order, e.g.:
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- `app/im`
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- `app/cryptpad`
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- `app/drone-ci`
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