fix(self-hosting): grow seaweedfs one volume at a time (#3076)

deploy/self-hosting/.env.example

@@ -448,6 +448,11 @@ FLUXER_DISCOVERY_ENABLED=true
 #FLUXER_SEAWEEDFS_GOMEMLIMIT=1536MiB
 #FLUXER_SEAWEEDFS_TELEMETRY=false
 
+# Volumes SeaweedFS creates at once when a bucket needs space. Each reserves 1 GB
+# of free disk from the start, and SeaweedFS's own default of 7 fills a small
+# disk before every bucket has one, so uploads fail with no free volumes left.
+#FLUXER_SEAWEEDFS_VOLUME_GROWTH=1
+
 # Node sizes its heap from the container limit by default. Leave these unset
 # unless you need to pin it. A heap ceiling above the container limit gets the
 # container OOM-killed instead of reporting a heap error. The values below are

deploy/self-hosting/docker-compose.yml

@@ -353,6 +353,7 @@ services:
           memory: ${FLUXER_SEAWEEDFS_MEMORY_LIMIT:-2gb}
     environment:
       GOMEMLIMIT: ${FLUXER_SEAWEEDFS_GOMEMLIMIT:-1536MiB}
+      WEED_MASTER_VOLUME_GROWTH_COPY_1: ${FLUXER_SEAWEEDFS_VOLUME_GROWTH:-1}
     command: ["server", "-s3", "-dir=/data", "-master.telemetry=${FLUXER_SEAWEEDFS_TELEMETRY:-false}"]
     volumes:
       - seaweedfs-data:/data