else                                                                              echo -n "NO"                                                                  fi                                                                              admin@i-08604040ea56a1548:~$ file kihei                                         kihei: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), statically linked, Gadmin@i-08604040ea56a1548:~$ ./kihei                                            panic: exit status 1                                                                                                                                            goroutine 1 [running]:                                                          main.main()                                                                             ./main.go:64 +0x47d                                                     admin@i-08604040ea56a1548:~$ which vim                                          /usr/bin/vim                                                                    admin@i-08604040ea56a1548:~$ vim -b kihei                                       (gdb) e.in runtime/sys_linux_amd64.so such file or directory.in at main.go:16   

                                                                                [GIN-debug] [WARNING] Running in "debug" mode. Switch to "release" mode in produ - using env:   export GIN_MODE=release                                          - using code:  gin.SetMode(gin.ReleaseMode)                                                                                                                    [GIN-debug] GET    /ping                     --> main.setupRouter.func1 (3 handl[GIN-debug] GET    /checkscript/:md5sum      --> main.setupRouter.func2 (3 handl[GIN-debug] GET    /checkcommand             --> main.setupRouter.func3 (3 handl[GIN-debug] GET    /gethistory               --> main.setupRouter.func4 (3 handl[GIN-debug] GET    /getlog                   --> main.setupRouter.func5 (3 handl[GIN-debug] Listening and serving HTTP on :6767                                 [GIN-debug] [ERROR] listen tcp :6767: bind: address already in use              admin@i-0a03c1c0d563d7772:~/agent$                                              admin@i-0a03c1c0d563d7772:~/agent$                                              admin@i-0a03c1c0d563d7772:~/agent$ bash check.sh                                

                                                                                example:  knock myserver.example.com 123:tcp 456:udp 789:tcp                                                                                                    admin@i-080ac908debd2d3d7:~$ knock -v 127.0.0.1 80:tcp 1                        hitting tcp 127.0.0.1:80                                                        hitting tcp 127.0.0.1:1                                                         admin@i-080ac908debd2d3d7:~$ knock -v 127.0.0.1 80:tcp                          hitting tcp 127.0.0.1:80                                                        admin@i-080ac908debd2d3d7:~$ curl -D - -v localhost                             *   Trying 127.0.0.1:80...                                                      * connect to 127.0.0.1 port 80 failed: Connection refused                       * Failed to connect to localhost port 80: Connection refused                    * Closing connection 0                                                          curl: (7) Failed to connect to localhost port 80: Connection refused            admin@i-080ac908debd2d3d7:~$ nc -vv 12                                          

xxd: Broken pipe                                                                admin@i-032a23e8be421d153:~$ xxd datafile | head ^C                             admin@i-032a23e8be421d153:~$ gzip datafile                                      ^C                                                                              admin@i-032a23e8be421d153:~$ ls                                                 agent  data  datafile  kihei                                                    admin@i-032a23e8be421d153:~$ df -h                                              Filesystem       Size  Used Avail Use% Mounted on                               udev             217M     0  217M   0% /dev                                     tmpfs             46M  368K   46M   1% /run                                     /dev/nvme0n1p1   7.7G  6.1G  1.2G  84% /                                        tmpfs            228M   12K  228M   1% /dev/shm                                 tmpfs            5.0M     0  5.0M   0% /run/lock                                /dev/nvme0n1p15  124M  5.9M  118M   5% /boot/efi                                admin@i-032a23e8be421d153:~$