Do my network setting look correct? Create new host gives error

Current version 6.2.0
OS: Debian 11
Hardware: 6th gen i5, 32GB RAM
Storage: 1TB SSD, 2TB SSD, 4TB SSD

So far I have only installed ON and created a new virtual network through the sunstone interface. My settings below.

I tried creating a new host, here is my config:

I get the host error: "Wed Apr 13 15:52:18 2022 : Error monitoring Host testing_host (5): " and it’s stuck at the INIT stage when I try to enable it.

sunstone.log gives me

Wed Apr 13 15:49:55 2022 [I]: 216.201.189.234 - - [13/Apr/2022:15:49:55 -0500] "GET /host?timeout=false&pool_filter=-2&csrftoken=dc12744b7503d93a2919d12
78f85911a950aed0fdc6f558a0f206fa61cb16ffe HTTP/1.1" 200 - 0.1838                                                                                        
Wed Apr 13 15:49:55 2022 [I]: 216.201.189.234 - - [13/Apr/2022:15:49:55 -0500] "GET /user/0?id=0&csrftoken=dc12744b7503d93a2919d1278f85911a950aed0fdc6f5
58a0f206fa61cb16ffe HTTP/1.1" 200 - 0.0027                                                                                                              
Wed Apr 13 15:49:57 2022 [I]: 216.201.189.234 - - [13/Apr/2022:15:49:57 -0500] "GET /cluster?timeout=true&pool_filter=-2&csrftoken=dc12744b7503d93a2919d
1278f85911a950aed0fdc6f558a0f206fa61cb16ffe HTTP/1.1" 200 - 0.0070                                                                                      
Wed Apr 13 15:50:08 2022 [I]: 216.201.189.234 - - [13/Apr/2022:15:50:08 -0500] "POST /host HTTP/1.1" 201 - 0.2392                                       
Wed Apr 13 15:50:08 2022 [I]: 216.201.189.234 - - [13/Apr/2022:15:50:08 -0500] "GET /host?timeout=false&pool_filter=-2&csrftoken=dc12744b7503d93a2919d12
78f85911a950aed0fdc6f558a0f206fa61cb16ffe HTTP/1.1" 200 - 0.0074                                                                                        
Wed Apr 13 15:50:08 2022 [I]: 216.201.189.234 - - [13/Apr/2022:15:50:08 -0500] "GET /user/0?id=0&csrftoken=dc12744b7503d93a2919d1278f85911a950aed0fdc6f5
58a0f206fa61cb16ffe HTTP/1.1" 200 - 0.0078                                                                                                              
Wed Apr 13 15:50:10 2022 [I]: 216.201.189.234 - - [13/Apr/2022:15:50:10 -0500] "GET /user/0?id=0&csrftoken=dc12744b7503d93a2919d1278f85911a950aed0fdc6f5
58a0f206fa61cb16ffe HTTP/1.1" 200 - 0.0090                                                                                                              
Wed Apr 13 15:50:10 2022 [I]: 216.201.189.234 - - [13/Apr/2022:15:50:10 -0500] "GET /host/5?id=5&csrftoken=dc12744b7503d93a2919d1278f85911a950aed0fdc6f5
58a0f206fa61cb16ffe HTTP/1.1" 200 - 0.0104                                                                                                              
Wed Apr 13 15:50:10 2022 [I]: 216.201.189.234 - - [13/Apr/2022:15:50:10 -0500] "GET /vm?timeout=true&pool_filter=-2&csrftoken=dc12744b7503d93a2919d1278f
85911a950aed0fdc6f558a0f206fa61cb16ffe HTTP/1.1" 200 - 0.0067                                                                                           
Wed Apr 13 15:50:24 2022 [I]: 216.201.189.234 - - [13/Apr/2022:15:50:24 -0500] "POST /cluster/0/action HTTP/1.1" 204 - 0.2052                           
Wed Apr 13 15:50:24 2022 [I]: 216.201.189.234 - - [13/Apr/2022:15:50:24 -0500] "GET /host/5?id=5&csrftoken=dc12744b7503d93a2919d1278f85911a950aed0fdc6f5
58a0f206fa61cb16ffe HTTP/1.1" 200 - 0.0029                                                                                                              
Wed Apr 13 15:50:24 2022 [I]: 216.201.189.234 - - [13/Apr/2022:15:50:24 -0500] "GET /cluster?timeout=false&pool_filter=-2&csrftoken=dc12744b7503d93a2919
d1278f85911a950aed0fdc6f558a0f206fa61cb16ffe HTTP/1.1" 200 - 0.0026                                                                                     
Wed Apr 13 15:50:33 2022 [I]: 216.201.189.234 - - [13/Apr/2022:15:50:33 -0500] "GET /bower_components/datatables/media/images/sort_asc.png HTTP/1.1" 200
 - 0.0012                                                                                                                                               
Wed Apr 13 15:50:38 2022 [I]: 216.201.189.234 - - [13/Apr/2022:15:50:38 -0500] "GET /host/5/monitor?monitor_resources=CAPACITY%2FUSED_CPU%2CCAPACITY%2FF
REE_CPU%2CCAPACITY%2FUSED_MEMORY%2CCAPACITY%2FFREE_MEMORY&csrftoken=dc12744b7503d93a2919d1278f85911a950aed0fdc6f558a0f206fa61cb16ffe HTTP/1.1" 200 - 0.1
863                                                                                                                                                     
Wed Apr 13 15:50:45 2022 [I]: 216.201.189.234 - - [13/Apr/2022:15:50:45 -0500] "POST /host/5/action HTTP/1.1" 204 - 0.1926                              
Wed Apr 13 15:50:45 2022 [I]: 216.201.189.234 - - [13/Apr/2022:15:50:45 -0500] "GET /host/5?id=5&csrftoken=dc12744b7503d93a2919d1278f85911a950aed0fdc6f5
58a0f206fa61cb16ffe HTTP/1.1" 200 - 0.0030                                                                                                              
Wed Apr 13 15:50:55 2022 [I]: 216.201.189.234 - - [13/Apr/2022:15:50:55 -0500] "POST /host/5/action HTTP/1.1" 204 - 0.0301                              
Wed Apr 13 15:50:55 2022 [I]: 216.201.189.234 - - [13/Apr/2022:15:50:55 -0500] "GET /host/5?id=5&csrftoken=dc12744b7503d93a2919d1278f85911a950aed0fdc6f5
58a0f206fa61cb16ffe HTTP/1.1" 200 - 0.0089                                                                                                              
Wed Apr 13 15:51:07 2022 [I]: 216.201.189.234 - - [13/Apr/2022:15:51:07 -0500] "GET /host/5/monitor?monitor_resources=CAPACITY%2FUSED_CPU%2CCAPACITY%2FF
REE_CPU%2CCAPACITY%2FUSED_MEMORY%2CCAPACITY%2FFREE_MEMORY&csrftoken=dc12744b7503d93a2919d1278f85911a950aed0fdc6f558a0f206fa61cb16ffe HTTP/1.1" 200 - 0.1
864                                                                                                                                                     
Wed Apr 13 15:51:19 2022 [I]: 216.201.189.234 - - [13/Apr/2022:15:51:19 -0500] "GET /host?timeout=false&pool_filter=-2&csrftoken=dc12744b7503d93a2919d12
78f85911a950aed0fdc6f558a0f206fa61cb16ffe HTTP/1.1" 200 - 0.1851                                                                                        
Wed Apr 13 15:51:19 2022 [I]: 216.201.189.234 - - [13/Apr/2022:15:51:19 -0500] "GET /user/0?id=0&csrftoken=dc12744b7503d93a2919d1278f85911a950aed0fdc6f5
58a0f206fa61cb16ffe HTTP/1.1" 200 - 0.0028                                                                                                              
Wed Apr 13 15:51:22 2022 [I]: 216.201.189.234 - - [13/Apr/2022:15:51:22 -0500] "GET /user/0?id=0&csrftoken=dc12744b7503d93a2919d1278f85911a950aed0fdc6f5
58a0f206fa61cb16ffe HTTP/1.1" 200 - 0.0090                                                                                                              
Wed Apr 13 15:51:22 2022 [I]: 216.201.189.234 - - [13/Apr/2022:15:51:22 -0500] "GET /host/5?id=5&csrftoken=dc12744b7503d93a2919d1278f85911a950aed0fdc6f5
58a0f206fa61cb16ffe HTTP/1.1" 200 - 0.0133                                                                                                              
Wed Apr 13 15:51:22 2022 [I]: 216.201.189.234 - - [13/Apr/2022:15:51:22 -0500] "GET /vm?timeout=true&pool_filter=-2&csrftoken=dc12744b7503d93a2919d1278f
85911a950aed0fdc6f558a0f206fa61cb16ffe HTTP/1.1" 200 - 0.0068                                                                                           
Wed Apr 13 15:51:24 2022 [I]: 216.201.189.234 - - [13/Apr/2022:15:51:24 -0500] "GET /user/0?id=0&csrftoken=dc12744b7503d93a2919d1278f85911a950aed0fdc6f5
58a0f206fa61cb16ffe HTTP/1.1" 200 - 0.0080                                                                                                              
Wed Apr 13 15:51:27 2022 [I]: 216.201.189.234 - - [13/Apr/2022:15:51:27 -0500] "POST /host/5/action HTTP/1.1" 204 - 0.0135                              
Wed Apr 13 15:51:27 2022 [I]: 216.201.189.234 - - [13/Apr/2022:15:51:27 -0500] "GET /host/5?id=5&csrftoken=dc12744b7503d93a2919d1278f85911a950aed0fdc6f5
58a0f206fa61cb16ffe HTTP/1.1" 200 - 0.0085                                                                                                              
Wed Apr 13 15:51:30 2022 [I]: 216.201.189.234 - - [13/Apr/2022:15:51:30 -0500] "GET /host/5?id=5&csrftoken=dc12744b7503d93a2919d1278f85911a950aed0fdc6f5
58a0f206fa61cb16ffe HTTP/1.1" 200 - 0.1971                                                                                                              
Wed Apr 13 15:51:30 2022 [I]: 216.201.189.234 - - [13/Apr/2022:15:51:30 -0500] "GET /host?timeout=false&pool_filter=-2&csrftoken=dc12744b7503d93a2919d12
78f85911a950aed0fdc6f558a0f206fa61cb16ffe HTTP/1.1" 200 - 0.2000                                                                                        
Wed Apr 13 15:51:30 2022 [I]: 216.201.189.234 - - [13/Apr/2022:15:51:30 -0500] "GET /user/0?id=0&csrftoken=dc12744b7503d93a2919d1278f85911a950aed0fdc6f5
58a0f206fa61cb16ffe HTTP/1.1" 200 - 0.0047                                                                                                              
Wed Apr 13 15:51:37 2022 [I]: 216.201.189.234 - - [13/Apr/2022:15:51:37 -0500] "GET /user/0?id=0&csrftoken=dc12744b7503d93a2919d1278f85911a950aed0fdc6f5
58a0f206fa61cb16ffe HTTP/1.1" 200 - 0.0081                                                                                                              
Wed Apr 13 15:51:45 2022 [I]: 216.201.189.234 - - [13/Apr/2022:15:51:45 -0500] "GET /user/0?id=0&csrftoken=dc12744b7503d93a2919d1278f85911a950aed0fdc6f5
58a0f206fa61cb16ffe HTTP/1.1" 200 - 0.1965                                                                                                              
Wed Apr 13 15:51:45 2022 [I]: 216.201.189.234 - - [13/Apr/2022:15:51:45 -0500] "GET /host/5?id=5&csrftoken=dc12744b7503d93a2919d1278f85911a950aed0fdc6f5
58a0f206fa61cb16ffe HTTP/1.1" 200 - 0.1920                                                                                                              
Wed Apr 13 15:52:08 2022 [I]: 216.201.189.234 - - [13/Apr/2022:15:52:08 -0500] "GET /host/5?id=5&csrftoken=dc12744b7503d93a2919d1278f85911a950aed0fdc6f5
58a0f206fa61cb16ffe HTTP/1.1" 200 - 0.1869                                                                                                              
Wed Apr 13 15:52:09 2022 [I]: 216.201.189.234 - - [13/Apr/2022:15:52:09 -0500] "GET /host/5?id=5&csrftoken=dc12744b7503d93a2919d1278f85911a950aed0fdc6f5
58a0f206fa61cb16ffe HTTP/1.1" 200 - 0.0092                                                                                                              
Wed Apr 13 15:52:11 2022 [I]: 216.201.189.234 - - [13/Apr/2022:15:52:11 -0500] "POST /host/5/action HTTP/1.1" 204 - 0.0132                              
Wed Apr 13 15:52:11 2022 [I]: 216.201.189.234 - - [13/Apr/2022:15:52:11 -0500] "GET /host/5?id=5&csrftoken=dc12744b7503d93a2919d1278f85911a950aed0fdc6f5
58a0f206fa61cb16ffe HTTP/1.1" 200 - 0.0089                                                                                                              
Wed Apr 13 15:52:15 2022 [I]: 216.201.189.234 - - [13/Apr/2022:15:52:15 -0500] "GET /host?timeout=false&pool_filter=-2&csrftoken=dc12744b7503d93a2919d12
78f85911a950aed0fdc6f558a0f206fa61cb16ffe HTTP/1.1" 200 - 0.1843                                                                                        
Wed Apr 13 15:52:15 2022 [I]: 216.201.189.234 - - [13/Apr/2022:15:52:15 -0500] "GET /user/0?id=0&csrftoken=dc12744b7503d93a2919d1278f85911a950aed0fdc6f5
58a0f206fa61cb16ffe HTTP/1.1" 200 - 0.0030                                                                                                              
Wed Apr 13 15:52:24 2022 [I]: 216.201.189.234 - - [13/Apr/2022:15:52:24 -0500] "GET /user/0?id=0&csrftoken=dc12744b7503d93a2919d1278f85911a950aed0fdc6f5
58a0f206fa61cb16ffe HTTP/1.1" 200 - 0.0092                                                                                                              
Wed Apr 13 15:52:24 2022 [I]: 216.201.189.234 - - [13/Apr/2022:15:52:24 -0500] "GET /host/5?id=5&csrftoken=dc12744b7503d93a2919d1278f85911a950aed0fdc6f5
58a0f206fa61cb16ffe HTTP/1.1" 200 - 0.0110                                                                                                              
Wed Apr 13 15:52:24 2022 [I]: 216.201.189.234 - - [13/Apr/2022:15:52:24 -0500] "GET /vm?timeout=true&pool_filter=-2&csrftoken=dc12744b7503d93a2919d1278f
85911a950aed0fdc6f558a0f206fa61cb16ffe HTTP/1.1" 200 - 0.0068                                                                                           
Wed Apr 13 15:54:20 2022 [I]: 216.201.189.234 - - [13/Apr/2022:15:54:20 -0500] "POST /host/5/action HTTP/1.1" 204 - 0.2048                              
Wed Apr 13 15:54:20 2022 [I]: 216.201.189.234 - - [13/Apr/2022:15:54:20 -0500] "GET /host/5?id=5&csrftoken=dc12744b7503d93a2919d1278f85911a950aed0fdc6f5
58a0f206fa61cb16ffe HTTP/1.1" 200 - 0.0029                                                                                                              
Wed Apr 13 15:54:20 2022 [I]: 216.201.189.234 - - [13/Apr/2022:15:54:20 -0500] "GET /vm?timeout=true&pool_filter=-2&csrftoken=dc12744b7503d93a2919d1278f
85911a950aed0fdc6f558a0f206fa61cb16ffe HTTP/1.1" 200 - 0.0037                                                                                           
Wed Apr 13 15:54:24 2022 [I]: 216.201.189.234 - - [13/Apr/2022:15:54:24 -0500] "GET /host?timeout=false&pool_filter=-2&csrftoken=dc12744b7503d93a2919d12
78f85911a950aed0fdc6f558a0f206fa61cb16ffe HTTP/1.1" 200 - 0.0078                                                                                        
Wed Apr 13 15:54:24 2022 [I]: 216.201.189.234 - - [13/Apr/2022:15:54:24 -0500] "GET /user/0?id=0&csrftoken=dc12744b7503d93a2919d1278f85911a950aed0fdc6f5
58a0f206fa61cb16ffe HTTP/1.1" 200 - 0.0077                                                                                                              
Wed Apr 13 15:54:32 2022 [I]: 216.201.189.234 - - [13/Apr/2022:15:54:32 -0500] "POST /host/5/action HTTP/1.1" 204 - 0.2046                              
Wed Apr 13 15:54:32 2022 [I]: 216.201.189.234 - - [13/Apr/2022:15:54:32 -0500] "GET /host/5?id=5&csrftoken=dc12744b7503d93a2919d1278f85911a950aed0fdc6f5
58a0f206fa61cb16ffe HTTP/1.1" 200 - 0.0031                                                                                                              
Wed Apr 13 15:54:35 2022 [I]: 216.201.189.234 - - [13/Apr/2022:15:54:35 -0500] "POST /host/5/action HTTP/1.1" 204 - 0.0298                              
Wed Apr 13 15:54:35 2022 [I]: 216.201.189.234 - - [13/Apr/2022:15:54:35 -0500] "GET /host/5?id=5&csrftoken=dc12744b7503d93a2919d1278f85911a950aed0fdc6f5
58a0f206fa61cb16ffe HTTP/1.1" 200 - 0.0089                                                                                                              
Wed Apr 13 15:54:42 2022 [I]: 216.201.189.234 - - [13/Apr/2022:15:54:42 -0500] "GET /host?timeout=false&pool_filter=-2&csrftoken=dc12744b7503d93a2919d12
78f85911a950aed0fdc6f558a0f206fa61cb16ffe HTTP/1.1" 200 - 0.0079                                                                                        
Wed Apr 13 15:54:42 2022 [I]: 216.201.189.234 - - [13/Apr/2022:15:54:42 -0500] "GET /host/5?id=5&csrftoken=dc12744b7503d93a2919d1278f85911a950aed0fdc6f5
58a0f206fa61cb16ffe HTTP/1.1" 200 - 0.0107                                                                                                              
Wed Apr 13 15:54:42 2022 [I]: 216.201.189.234 - - [13/Apr/2022:15:54:42 -0500] "GET /user/0?id=0&csrftoken=dc12744b7503d93a2919d1278f85911a950aed0fdc6f5
58a0f206fa61cb16ffe HTTP/1.1" 200 - 0.0076                                                                                                              
Wed Apr 13 15:55:05 2022 [I]: 216.201.189.234 - - [13/Apr/2022:15:55:05 -0500] "POST /host/5/action HTTP/1.1" 204 - 0.2045                              
Wed Apr 13 15:55:05 2022 [I]: 216.201.189.234 - - [13/Apr/2022:15:55:05 -0500] "GET /host/5?id=5&csrftoken=dc12744b7503d93a2919d1278f85911a950aed0fdc6f5
58a0f206fa61cb16ffe HTTP/1.1" 200 - 0.0029                                                                                                              
Wed Apr 13 15:55:08 2022 [I]: 216.201.189.234 - - [13/Apr/2022:15:55:08 -0500] "POST /host/5/action HTTP/1.1" 204 - 0.0298                              
Wed Apr 13 15:55:08 2022 [I]: 216.201.189.234 - - [13/Apr/2022:15:55:08 -0500] "GET /host/5?id=5&csrftoken=dc12744b7503d93a2919d1278f85911a950aed0fdc6f5
58a0f206fa61cb16ffe HTTP/1.1" 200 - 0.0085    

Any ideas? Thanks

Look for possible monitoring errors in /var/log/one/monitor.log.

Here is what I have in monitor.log:

Thu Apr 14 12:37:12 2022 [Z0][HMM][I]: --Mark--                                                                                                         
Thu Apr 14 12:37:12 2022 [Z0][HMM][D]: Monitoring host testing_host(5)                                                                                  
Thu Apr 14 12:39:22 2022 [Z0][MDP][I]: Command execution failed (exit code: 255): mkdir -p /var/tmp/one                                                 
Thu Apr 14 12:39:22 2022 [Z0][MDP][I]: ssh: connect to host testing_host port 22: Connection timed out                                                  
Thu Apr 14 12:39:22 2022 [Z0][MDP][W]: Start monitor failed for host 5: Could not update remotes                                                        
Thu Apr 14 12:39:22 2022 [Z0][HMM][E]: Unable to monitor host id: 5                                                                                     
Thu Apr 14 12:40:27 2022 [Z0][HMM][D]: Monitoring host testing_host(5)                                                                                  
Thu Apr 14 12:42:36 2022 [Z0][MDP][I]: Command execution failed (exit code: 255): mkdir -p /var/tmp/one                                                 
Thu Apr 14 12:42:36 2022 [Z0][MDP][I]: ssh: connect to host testing_host port 22: Connection timed out                                                  
Thu Apr 14 12:42:36 2022 [Z0][MDP][W]: Start monitor failed for host 5: Could not update remotes                                                        
Thu Apr 14 12:42:36 2022 [Z0][HMM][E]: Unable to monitor host id: 5                                                                                     
Thu Apr 14 12:43:42 2022 [Z0][HMM][D]: Monitoring host testing_host(5)                                                                                  
Thu Apr 14 12:45:53 2022 [Z0][MDP][I]: Command execution failed (exit code: 255): mkdir -p /var/tmp/one                                                 
Thu Apr 14 12:45:53 2022 [Z0][MDP][I]: ssh: connect to host testing_host port 22: Connection timed out                                                  
Thu Apr 14 12:45:53 2022 [Z0][MDP][W]: Start monitor failed for host 5: Could not update remotes                                                        
Thu Apr 14 12:45:53 2022 [Z0][HMM][E]: Unable to monitor host id: 5                                                                                     
Thu Apr 14 12:46:57 2022 [Z0][HMM][D]: Monitoring host testing_host(5)                                                                                  
Thu Apr 14 12:47:12 2022 [Z0][HMM][I]: --Mark--                                                                                                         
Thu Apr 14 12:49:08 2022 [Z0][MDP][I]: Command execution failed (exit code: 255): mkdir -p /var/tmp/one                                                 
Thu Apr 14 12:49:08 2022 [Z0][MDP][I]: ssh: connect to host testing_host port 22: Connection timed out                                                  
Thu Apr 14 12:49:08 2022 [Z0][MDP][W]: Start monitor failed for host 5: Could not update remotes                                                        
Thu Apr 14 12:49:08 2022 [Z0][HMM][E]: Unable to monitor host id: 5                                                                                     
Thu Apr 14 12:50:12 2022 [Z0][HMM][D]: Monitoring host testing_host(5)                                                                                  
Thu Apr 14 12:52:22 2022 [Z0][MDP][I]: Command execution failed (exit code: 255): mkdir -p /var/tmp/one                                                 
Thu Apr 14 12:52:22 2022 [Z0][MDP][I]: ssh: connect to host testing_host port 22: Connection timed out                                                  
Thu Apr 14 12:52:22 2022 [Z0][MDP][W]: Start monitor failed for host 5: Could not update remotes                                                        
Thu Apr 14 12:52:22 2022 [Z0][HMM][E]: Unable to monitor host id: 5                                                                                     
Thu Apr 14 12:53:27 2022 [Z0][HMM][D]: Monitoring host testing_host(5)                                                                                  
Thu Apr 14 12:55:37 2022 [Z0][MDP][I]: Command execution failed (exit code: 255): mkdir -p /var/tmp/one                                                 
Thu Apr 14 12:55:37 2022 [Z0][MDP][I]: ssh: connect to host testing_host port 22: Connection timed out                                                  
Thu Apr 14 12:55:37 2022 [Z0][MDP][W]: Start monitor failed for host 5: Could not update remotes                                                        
Thu Apr 14 12:55:37 2022 [Z0][HMM][E]: Unable to monitor host id: 5                                                                                     
Thu Apr 14 12:56:42 2022 [Z0][HMM][D]: Monitoring host testing_host(5)                                                                                  
Thu Apr 14 12:57:12 2022 [Z0][HMM][I]: --Mark--                                                                                                         
Thu Apr 14 12:58:51 2022 [Z0][MDP][I]: Command execution failed (exit code: 255): mkdir -p /var/tmp/one                                                 
Thu Apr 14 12:58:51 2022 [Z0][MDP][I]: ssh: connect to host testing_host port 22: Connection timed out                                                  
Thu Apr 14 12:58:51 2022 [Z0][MDP][W]: Start monitor failed for host 5: Could not update remotes                                                        
Thu Apr 14 12:58:51 2022 [Z0][HMM][E]: Unable to monitor host id: 5                                                                                     
Thu Apr 14 12:59:57 2022 [Z0][HMM][D]: Monitoring host testing_host(5)                                                                                  
Thu Apr 14 13:02:08 2022 [Z0][MDP][I]: Command execution failed (exit code: 255): mkdir -p /var/tmp/one                                                 
Thu Apr 14 13:02:08 2022 [Z0][MDP][I]: ssh: connect to host testing_host port 22: Connection timed out                                                  
Thu Apr 14 13:02:08 2022 [Z0][MDP][W]: Start monitor failed for host 5: Could not update remotes                                                        
Thu Apr 14 13:02:08 2022 [Z0][HMM][E]: Unable to monitor host id: 5                                                                                     
Thu Apr 14 13:03:12 2022 [Z0][HMM][D]: Monitoring host testing_host(5)                                                                                  
Thu Apr 14 13:05:22 2022 [Z0][MDP][I]: Command execution failed (exit code: 255): mkdir -p /var/tmp/one                                                 
Thu Apr 14 13:05:22 2022 [Z0][MDP][I]: ssh: connect to host testing_host port 22: Connection timed out                                                  
Thu Apr 14 13:05:22 2022 [Z0][MDP][W]: Start monitor failed for host 5: Could not update remotes                                                        
Thu Apr 14 13:05:22 2022 [Z0][HMM][E]: Unable to monitor host id: 5                                                                                     
Thu Apr 14 13:06:27 2022 [Z0][HMM][D]: Monitoring host testing_host(5)                                                                                  
Thu Apr 14 13:07:12 2022 [Z0][HMM][I]: --Mark--                                                                                                         
Thu Apr 14 13:08:37 2022 [Z0][MDP][I]: Command execution failed (exit code: 255): mkdir -p /var/tmp/one                                                 
Thu Apr 14 13:08:37 2022 [Z0][MDP][I]: ssh: connect to host testing_host port 22: Connection timed out                                                  
Thu Apr 14 13:08:37 2022 [Z0][MDP][W]: Start monitor failed for host 5: Could not update remotes                                                        
Thu Apr 14 13:08:37 2022 [Z0][HMM][E]: Unable to monitor host id: 5                                                                                     
Thu Apr 14 13:09:42 2022 [Z0][HMM][D]: Monitoring host testing_host(5)          

Well, there you go

Thu Apr 14 12:39:22 2022 [Z0][MDP][I]: Command execution failed (exit code: 255): mkdir -p /var/tmp/one
Thu Apr 14 12:39:22 2022 [Z0][MDP][I]: ssh: connect to host testing_host port 22: Connection timed out

This suggests the frontend is unable to connect via SSH to the host you added. Please review the node installation and especially make sure the oneadmin user in the frontend can access via SSH, without password, to the host you added.

Ok thanks for the pointers. So far I installed OpenNebula KVM Node Package:

# apt-get update
# apt-get -y install opennebula-node-kvm
# systemctl restart libvirtd

Disabled AppArmor:
Depending on your OpenNebula deployment type, the following lines might be required at /etc/apparmor.d/abstractions/libvirt-qemu profile:

/var/lib/one/datastores/** rwk,

When I was about to configure SSH, I saw this in the docs:

Since OpenNebula 5.12 . On the Front-end runs dedicated SSH authentication agent service which imports the oneadmin ’s private key on its start. Access to this agent is delegated (forwarded) from the OpenNebula Front-end to the hypervisor Nodes for the operations which need to connect between Nodes or back to the Front-end. While the authentication agent is used, you don’t need to distribute private SSH key from Front-end to hypervisor Nodes!

Since I have installed 6.2.0, what should be my next step to configure SSH?