Linux Server ops

Restrict port by GeoIP
https://www.seenlyst.com/blog/geo-blocking-ufw-iptables/

https://blog.reverside.ch/UFW-GeoIP-and-how-to-get-there/
IPtables
https://ithelp.ithome.com.tw/articles/10312284

Digitalocean

Basic - 2vCPU / 2Gb / SSD

https://cylab.be/blog/330/benchmark-linux-systems-with-sysbench?accept-cookies=1

sysbench CPU Single-thread

CPU speed:
    events per second:   924.48

General statistics:
    total time:                          10.0006s
    total number of events:              9247

Latency (ms):
         min:                                    0.97
         avg:                                    1.08
         max:                                    1.70
         95th percentile:                        1.34
         sum:                                 9990.05

Threads fairness:
    events (avg/stddev):           9247.0000/0.00
    execution time (avg/stddev):   9.9901/0.00

sysbench CPU Multi-thread

CPU speed:
    events per second:  1778.18

General statistics:
    total time:                          10.0008s
    total number of events:              17787

Latency (ms):
         min:                                    0.97
         avg:                                    1.12
         max:                                    3.35
         95th percentile:                        1.37
         sum:                                19973.12

Threads fairness:
    events (avg/stddev):           8893.5000/61.50
    execution time (avg/stddev):   9.9866/0.00

sysbench Memory

Total operations: 33993717 (3398575.78 per second)

33196.99 MiB transferred (3318.92 MiB/sec)

General statistics:
    total time:                          10.0003s
    total number of events:              33993717

Latency (ms):
         min:                                    0.00
         avg:                                    0.00
         max:                                  229.62
         95th percentile:                        0.00
         sum:                                 4694.85

Threads fairness:
    events (avg/stddev):           33993717.0000/0.00
    execution time (avg/stddev):   4.6949/0.00

sysbench Storage-Random Read 4k

Throughput:
    read, MiB/s:                  21.05
    written, MiB/s:               0.00

sysbench Storage-Random Write 4k

Throughput:
    read, MiB/s:                  0.00
    written, MiB/s:               126.66

sysbench Storage-Seq Read 1M

Throughput:
    read, MiB/s:                  393.88
    written, MiB/s:               0.00

sysbench Storage-Seq Write 1M

Throughput:
    read, MiB/s:                  0.00
    written, MiB/s:               463.07

Basic - Intel 2vCPU / 2Gb / NVME

https://cylab.be/blog/330/benchmark-linux-systems-with-sysbench?accept-cookies=1

sysbench CPU single-thread

CPU speed:
    events per second:  2102.17

General statistics:
    total time:                          10.0002s
    total number of events:              21027

Latency (ms):
         min:                                    0.46
         avg:                                    0.48
         max:                                    0.92
         95th percentile:                        0.49
         sum:                                 9990.58

Threads fairness:
    events (avg/stddev):           21027.0000/0.00
    execution time (avg/stddev):   9.9906/0.00

sysbench CPU Multi-thread

CPU speed:
    events per second:  4174.63

General statistics:
    total time:                          10.0003s
    total number of events:              41757

Latency (ms):
         min:                                    0.46
         avg:                                    0.48
         max:                                    4.63
         95th percentile:                        0.50
         sum:                                19972.28

Threads fairness:
    events (avg/stddev):           20878.5000/19.50
    execution time (avg/stddev):   9.9861/0.00

sysbench memory

Total operations: 43904392 (4389328.76 per second)

42875.38 MiB transferred (4286.45 MiB/sec)

General statistics:
    total time:                          10.0002s
    total number of events:              43904392

Latency (ms):
         min:                                    0.00
         avg:                                    0.00
         max:                                    0.15
         95th percentile:                        0.00
         sum:                                 4116.05

Threads fairness:
    events (avg/stddev):           43904392.0000/0.00
    execution time (avg/stddev):   4.1160/0.00

sysbench Storage - Random Read 4k

Throughput:
    read, MiB/s:                  29.46
    written, MiB/s:               0.00

sysbench Storage - Random Write 4k

Throughput:
    read, MiB/s:                  0.00
    written, MiB/s:               291.43

sysbench Storage - Seq Read 1M

Throughput:
    read, MiB/s:                  1654.19
    written, MiB/s:               0.00

sysbench Storage - Seq Write 1M

Throughput:
    read, MiB/s:                  0.00
    written, MiB/s:               1302.48

CPanel

Cron job to remove emails
find /home/jwcorner/mail/jwcorner.com/noreply/ -type d \( -name cur -o -name new \) -exec find {} -mtime +1 -type f -delete \;