У меня был скрипт для разогрева кеша, типа:
#!/bin/bash
# Sleep for 10 sec to eliminate race condition with renderd starts.
sleep 10
# Every zoom level rendered separately:
render_list -n 4 -x 44 -X 49 -y 26 -Y 29 -z 6 -Z 6 -a
render_list -n 4 -x 88 -X 98 -y 52 -Y 58 -z 7 -Z 7 -a
render_list -n 4 -x 176 -X 196 -y 104 -Y 116 -z 8 -Z 8 -a
render_list -n 4 -x 352 -X 392 -y 208 -Y 232 -z 9 -Z 9 -a
render_list -n 4 -x 704 -X 784 -y 416 -Y 464 -z 10 -Z 10 -a
render_list -n 4 -x 1408 -X 1568 -y 832 -Y 928 -z 11 -Z 11 -a
render_list -n 4 -x 2816 -X 3136 -y 1664 -Y 1856 -z 12 -Z 12 -a
render_list -n 4 -x 5632 -X 6272 -y 3328 -Y 3712 -z 13 -Z 13 -a
# x,X,y,Y just doubled at next zoom level.
# i.e. it is enough to find them for upper zoom level, which usually 5 or 6
запускался с крона с тагом ребут.