Let’s quickly remove the container using docker rm -f 287 and add another temporary filesystem pointing to /var/run : Nginx: open () '/var/run/nginx.pid' failed (30: Read-only file system )īummer! It fails again because NGINX wants to create a PID-file. Let’s allow /var/cache/nginx/ for modifications by applying tmpfs to our docker run command: We will ignore this for now because we don’t want our webserver to apply runtime modifications to the default configuration file.Īdditionally, it tried to create the client_temp folder at /var/cache/nginx/client_temp, which also failed because of the filesystem was read-only. We saw that the webserver tried to modify the NGINX configuration file located at /etc/nginx/conf.d/nf. Temporary filesystem (tmpfs) in Dockerīut let’s revisit the logs created by nginx:alpine from the previous section. On top of that, multiple containers can’t share the temporary filesystem. That said, everything written to the temporary filesystem will be gone when the container gets terminated. It mounts an area of the host memory to a specific location in the container. However, a temporary filesystem is not persistent. In Docker, a temporary filesystem (tmpfs) works theoretically like a regular volume, which allows us to mount storage from outside the container to a particular location. This is where temporary filesystem ( tmpfs) enters the stage. Somehow, we must allow NGINX writing to the necessary files and directories to get it working again. Nginx: mkdir () '/var/cache/nginx/client_temp' failed (30: Read-only file system )Īs you can see, we got several logs complaining about the filesystem being read-only. docker-entrypoint.sh: Configuration complete ready for start upĩ 06:39:51 1#1: mkdir () '/var/cache/nginx/client_temp' failed (30: Read-only file system ) docker-entrypoint.sh: Launching /docker-entrypoint.d/30-tune-worker-processes.sh docker-entrypoint.sh: Launching /docker-entrypoint.d/20-envsubst-on-templates.sh docker-entrypoint.sh: Launching /docker-entrypoint.d/10-listen-on-ipv6-by-default.shġ0-listen-on-ipv6-by-default.sh: info: can not modify /etc/nginx/conf.d/nf (read-only file system? ) docker-entrypoint.sh: Looking for shell scripts in /docker-entrypoint.d/ docker-entrypoint.sh: /docker-entrypoint.d/ is not empty, will attempt to perform configuration

Ubuntu docker and kubernetes