docs(en): Add cleanup guide

content/en/docs/How To Guides/manual_cleanup.md

@@ -0,0 +1,134 @@
+---
+title: "How to manually clean up your server's disk space"
+linkTitle: "Manual space cleanup"
+weight: 2
+date: 2023-03-14
+description: >
+    Manual cleanup might be required if you need more space on system volume.
+categories: ["How-To Guides"]
+---
+
+
+{{% pageinfo color="warning" %}}
+All commands in this guide are run as root via SSH.
+If you do not have root access, refer to [this guide](/docs/how-to-guides/root_ssh/) for more information.
+
+If you have no space left, you will only be able to use the SSH keys you previously added.
+If you run out of disk space and have not added any SSH keys, contact SelfPrivacy support for further assistance.
+{{% /pageinfo %}}
+
+There are several ways to clean up your server's disk space.
+
+To check how much disk space you have, run the following command:
+
+```bash
+df -h
+```
+
+This will output a table like this:
+
+```
+Filesystem      Size  Used Avail Use% Mounted on
+devtmpfs         97M     0   97M   0% /dev
+tmpfs           969M   52K  969M   1% /dev/shm
+tmpfs           485M  3.8M  481M   1% /run
+tmpfs           969M  432K  968M   1% /run/wrappers
+/dev/sda1        19G  8.2G  9.5G  47% /
+/dev/sdb         18G   62M   17G   1% /volumes/sdb
+tmpfs           194M     0  194M   0% /run/user/0
+```
+
+Here, the filesystem mounted on just `/` is your system volume.
+
+## Deleting old NixOS generations
+
+{{% alert title="Zero space warning" color="warning" %}}
+This method won't work if you have **no space left** on your system volume. Use other methods first.
+{{% /alert %}}
+
+NixOS allows you to roll back to previous system states at any time, at the cost of disk space.
+SelfPrivacy servers are configured to reclaim disk space by automatically deleting old system states,
+but only states older than 7 days are deleted, so you can still use the rollback feature.
+
+It is possible to manually delete all old system states, and it may give you more much needed disk space.
+To do this, simply run the following command as root:
+
+```bash
+nix-collect-garbage -d
+```
+
+This operation might take a while, depending on the number of system states you have.
+When it is done, you will see how much disk space you have freed up.
+
+## Deleting old logs
+
+Logs sometimes may take up quite a lot of disk space.
+On SelfPrivacy servers, system logs are always limited to 500MiB, but these are not the only
+log files you have on your server.
+
+To check how much disk space logs take up, run the following command:
+
+```bash
+du -h --max-depth=1 /var/log
+```
+
+The output will look something like this:
+
+```
+4.0K	/var/log/private
+14M     /var/log/nginx
+499M	/var/log/journal
+587M	/var/log
+```
+
+### System journal
+
+Here, `/var/log/journal` are the system logs where all apps usually write their logs. As you can see in this example,
+they respect the 500MiB limit.
+
+If you want to clear *all* system logs, run the following command:
+
+```bash 
+journalctl --rotate && journalctl --vacuum-time=1s
+```
+
+This will usually give you around 450 MiB of free disk space, but not for long.
+This may though be enough to run some commands that will free up more space.
+
+### Nginx logs
+
+The `/var/log/nginx` directory contains logs for the Nginx web server. If they got too big, you can clear them by running:
+
+```bash
+rm /var/log/nginx/* && systemctl reload nginx
+```
+
+As you can see, we don't just delete the files, but also reload Nginx.
+This is because Nginx will get confused by the missing log files, and they will not be recreated until Nginx is reloaded.
+
+## Deleting old system
+
+{{% alert color="warning" %}}
+This operation can only be performed once during the lifetime of your server.
+
+If you have installed SelfPrivacy on your own hardware, this may lead to some data loss.
+{{% /alert %}}
+
+When you install SelfPrivacy on a server, the existing system gets replaced by NixOS. But the old system is still there
+and takes up disk space, so you can roll back to it if you want.
+
+To measure how much disk space the old system takes up, run the following command:
+
+```bash
+du -h --max-depth=1 /old-root/
+```
+
+If there is no old system in place, you will see `du: cannot access '/old-root/': No such file or directory`.
+
+But if you do have an old system, you may delete it by running the following command:
+
+```bash
+rm -rf /old-root/
+```
+
+This usually frees up around 1.8 GiB of disk space on typical SelfPrivacy servers.

content/en/docs/How To Guides/root_ssh/_index.md

@@ -1,6 +1,7 @@
 ---
 title: "How to get root access via SSH"
-weight: 2
+linkTitle: "Root access via SSH"
+weight: 1
 date: 2023-03-14
 description: >
     If you need to manually perform some tasks, you can get root access via SSH.