Compose: Invalid interpolation format for "command" option in service "node-exporter": "^/(sys|proc|dev|host|etc)($|/)"

[HaoHappen]

I want to manage my Swarm services using Docker Compose YAML format
docker command:
docker service create --name node-exporter \ --mode global \ --network proxy \ --mount "type=bind,source=/proc,target=/host/proc" \ --mount "type=bind,source=/sys,target=/host/sys" \ --mount "type=bind,source=/,target=/rootfs" \ --mount "type=bind,source=/etc/hostname,target=/etc/host_hostname" \ -e HOST_HOSTNAME=/etc/host_hostname \ basi/node-exporter:v0.1.1 \ -collector.procfs /host/proc \ -collector.sysfs /host/proc \ -collector.filesystem.ignored-mount-points "^/(sys|proc|dev|host|etc)($|/)" \ -collector.textfile.directory /etc/node-exporter/ \ -collectors.enabled="conntrack,diskstats,entropy,filefd,filesystem,loadavg,m\ dadm,meminfo,netdev,netstat,stat,textfile,time,vmstat,ipvs"
compose.yml:
version: "3" services: node-exporter: image: basi/node-exporter:v0.1.1 networks: - mm volumes: - /proc:/host/proc - /sys:/host/sys - /:/rootfs - /etc/hostname:/etc/host_hostname environment: - HOST_HOSTNAME=/etc/host_hostname command: [ -collector.procfs,/host/proc,-collector.sysfs=/host/proc,-collector.filesystem.ignored-mount-points,"^/(sys|proc|dev|host|etc)($|/)",-collector.textfile.directory,/etc/node-exporter/,-collectors.enabled="conntrack,diskstats,entropy,filefd,filesystem,loadavg,mdadm,meminfo,netdev,netstat,stat,textfile,time,vmstat,ipvs"] deploy: mode: global

But got an error:Invalid interpolation format for "command" option in service "node-exporter": "^/(sys|proc|dev|host|etc)($|/)"
It seems that symbol $ caused. What format should I write it?

[shin-]

You can escape the $ symbol with another $. See the variable substitution docs for more info.

[HaoHappen]

thanks!

[sobi3ch]

Spent over an hour to find this answer. Thank you.

[sobi3ch]

You can use a $$ (double-dollar sign) when your configuration needs a literal dollar sign. This also prevents Compose from interpolating a value, so a $$ allows you to refer to environment variables that you don’t want processed by Compose.

web:
  build: .
  command: "$$VAR_NOT_INTERPOLATED_BY_COMPOSE"