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#1 2020-09-13 05:49:24

StormyGill
Member
Registered: 2020-09-13
Posts: 1

To serve files directly from RAM


Posted on Thursday January 01, 1970


Posted on Thursday January 01, 1970


Posted on Thursday January 01, 1970


Posted on Thursday January 01, 1970


Posted on Thursday January 01, 1970


Posted on Thursday January 01, 1970


Posted on Thursday January 01, 1970


Posted on Thursday January 01, 1970

Sort of CDN to serve client-side libraries via an auto-pull git repo on tmpfs

May 15, 2019July 9, 2019              This configuration will allow to install on a Debian-based system a fast server for client libraries.
Key technologies used are:  tmpfs to serve files from volatile memory.
git / mercurial from github / bitbucket to get files from a public or private repository.
systemd units to mount tmpfs and sync.
nginx to serve files to user.

On this first step you’ll create a service to reserve some RAM for static files

pulling them from a private or public repo.
Mount tmpfs with systemd.
To serve files directly from RAM, you have to mount a tmpfs directory.
You can do it on fstab: /etc/fstab  tmpfs /mnt/cdn tmpfs rw,nodev,nosuid,size=300M 0 0  Or with a systemd unit: /etc/systemd/system/mnt-cdn.mount  [Unit] Description=Mount empty CDN directory on volatile memory  [Mount] What=tmpfs Where=/mnt/cdn Type=tmpfs Options=defaults,noatime,size=300M  [Install] WantedBy=multi-user.target   noatime will disable last access on contained files, reducing write on disk.

Size will reserve 300MB for /mnt/cdn partition on RAM (increase as needed)

WantedBy=multi-user.target mount the partition on runlevel 3 (multi-user mode with networking).
Create two units on a local path like /usr/local/share/systemd then create a symlinks on /etc/systemd/system or create directly them on /etc/systemd/system.
You can also directly create them on /usr/local/share/systemd.
Create the pull service.

When the /mnt/cdn is successfully loaded

pull static files from your repository.

/etc/systemd/system/cdn-pull.service  [Unit] Description=Pull on CDN directory

After=network-online.target  [Service] User=youruserhere Group=youruserhere ExecStart=/usr/local/share/systemd/cdn-pull.sh  [Install] WantedBy=mnt-cdn.mount   Clone the git repository with a user on system using a key with an alias.
Change youruserhere to the user who cloned the repository.
Add to /root/.ssh/config and to  /root/.ssh/my_private_key the private key to do the pull.

Meaning:  WantedBy=mnt-cdn.mount copy the files to RAM only after the /mnt/cdn is created

After=network-online.target pull the repository only when the network is ready.
On pull, all files will be written by root as youruserhere:youruserhere.
After the pull, to reduce RAM occupation, this script doesn’t download directly to RAM .git directory but copy them with rsync excluding them: /usr/local/share/systemd/cdn-pull.sh  #!/bin/bash # stop on first error set -e cd /srv/cdn-all git pull exec rsync -a --exclude=.git --exclude=.gitignore /srv/cdn-all/* /mnt/cdn/  Get systemd to know about the mount and service.
To reload systemd units, you have to  systemctl daemon-reload  Then do the mount via the systemd unit:  systemctl start mnt-cdn.mount  Enable on boot.
Since the cdn-pull.service is tied to mnt-cdn.mount, both have to be enabled to run:  systemctl enable mnt-cdn.mount systemctl enable cdn-pull.service   When the system is ready create the tmpfs on /mnt/cdn/.
After tmpfs is successfully created by the unit, the file will be automatically synced through cdn-pull.service.
Mount will auto-start sync.
Start only the mnt-cdn.mount:  systemctl start mnt-cdn.mount  And then ask for info about both services:  systemctl status mnt-cdn.mount systemctl status cdn-pull.service   mnt-cdn.mount have to be active (mounted).
cdn-pull.service should be active (script is running) or inactive (sync is completed).
In both cases, it’s ok.
With this set-up, when you restart the mnt-cdn.mount files will be automatically pulled and synced to RAM when system starts and when you start or restart mnt-cdn.mount service.
Next you can serve these files on nginx and the final step could be to auto-detect push to update files automagically.
See also.

Mounting partitions using Systemd by James Oguya

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