cbtop tells you about a Couchbase cluster. Simply point it to one of the servers:
$ ./cbtop.py 10.2.1.65
DB Compaction:30.00 View Compaction:30.00 Min Items Threshold:10 Min Memory Threshold:10 Compact Running:False Disk Format Ver:0
HDD Quota:2.75T HDD Total:2.75T HDD Used:267.59G HDD Used By Data:119.97G RAM Quota:97.66G RAM Total:125.38G RAM Used:124.77G RAM Used By Data:71.10G
BUCKET PROXY RAM RAW_RAM #REPL DATA_USED DISK_USED #ITEMS #MEM_USED %MEM_USED TYPE
default 0 97.66G 24.41G 1 90.57G 119.97G 19.16M 71.09G 72.80 membase
HOST #ITEMS #ITEMS_TOT #REPL_ITEMS MCD_MEM_ALLOC MCD_MEM_RSVD MEM_FREE MEM_TOT PORT STATUS %CPU SWAP_TOT SWAP_USED
10.2.1.65:8091 4.79M 9.58M 4.79M 25678.00 25678.00 158.47M 31.35G 11210 healthy 48.38 10.57G 156.00K
10.2.1.66:8091 4.79M 9.58M 4.79M 25678.00 25678.00 156.31M 31.35G 11210 healthy 78.39 9.95G 156.00K
10.2.1.67:8091 4.79M 9.58M 4.79M 25678.00 25678.00 157.81M 31.35G 11210 healthy 91.25 9.97G 156.00K
10.2.1.68:8091 4.79M 9.58M 4.79M 25678.00 25678.00 153.09M 31.35G 11210 healthy 99.25 9.95G 156.00K
HOST #ERR_OOM EP_OVERHEAD TCM_MAX_TCACHE EP_MAX_DATA EP_LOW_WAT EP_HIGH_WAT EP_VAL #ERR_TMP_OOM TCM_UNMAPPED EP_BYTES_TOT TCM_CUR_TCACHE EP_KV
10.2.1.65 0.00 51.79M 4.00M 24.41G 14.65G 18.31G 16.57G 0.00 28.95M 17.65G 2.53M 17.35G
10.2.1.66 0.00 51.62M 4.00M 24.41G 14.65G 18.31G 16.64G 0.00 33.59M 17.71G 2.17M 17.41G
10.2.1.67 0.00 51.64M 4.00M 24.41G 14.65G 18.31G 16.46G 0.00 26.48M 17.54G 2.05M 17.23G
10.2.1.68 0.00 52.12M 4.00M 24.41G 14.65G 18.31G 17.12G 0.00 21.84M 18.20G 2.71M 17.89G
* Python 2.6 or 2.7
* pip
$ pip install blessings cbtestlib seriesly tabula