Baremetalhost's(BMH) Status sub-resource contain a handful of critical data regarding the BMH's state. If the Status is not moved with the object when we pivot the BMH from the management cluster to target cluster , the Baremetal Operator(BMO) considers it as a new object and triggers introspection for the BMH since its Status is empty. Status being empty means although the BMH had a ready state in management cluster (for example), it would be again in registering and inspecting states in target cluster since we have an BMH with empty Status in hand. This is the main motivation to take the BMH Status also with the object when we move the object from management cluster to target cluster.
To solve this issue, BMO now puts the Status of a BMH as an Annotation at
the end of each reconciliation loop. The name of the annotation is,
baremetalhost.metal3.io/status. This field holds the entire Status
sub-resource of BMH. As such within this annotation you will find all the fields
that belong to a BMH Status sub-resource.
The Status Annotation ensures that the Status of a BMH is always preserved as an annotation. In addition to this, BMO is now enhanced to reconstruct a BMH object Status if it is empty and the Status Annotation is present. This makes sure that when we pivot a BMH with Status Annotation , the BMO at the target cluster can reconstruct the BMH Status and so the reconciliation of BMH starts from the point it was before pivot. This essentially ensures all the critical data residing in BMH Status sub-resource is retained and BMH does not suffer any accidental introspection.
Note that in the case where only the hardware field requires update, the inspect annotation may also be used.
Here is an example of a Status annotation:
baremetalhost.metal3.io/status: '{"operationalStatus":"OK","lastUpdated":
"2020-05-13T15:03:45Z", "hardwareProfile":"unknown","hardware": {"systemVendor":
{"manufacturer":"QEMU","productName":"Standard PC (Q35 + ICH9, 2009)",
"serialNumber":""},"firmware":{"bios":{"date":"","vendor":"", "version":""}},
"ramMebibytes":4096,"nics":[{"name":"eth0","model":"0x1af4
x0001","mac":"00:55:4a:4a:79:1c","ip":"172.22.0.83","speedGbps":0, "vlanId":0,
"pxe":true},{"name":"eth1","model":"0x1af4 0x0001","mac":"00:55:4a:4a:79:1e",
"ip":"192.168.111.20","speedGbps":0,"vlanId":0,"pxe":false}],"storage":[{ "name"
:"/dev/sda","rotational":true, "sizeBytes":53687091200,"vendor":"QEMU",
"model":"QEMUHARDDISK", "serialNumber":"drive-scsi0-0-0-0","hctl":"6:0:0:0"}],
"cpu":{"arch":"x86_64","model":"Intel Xeon E3-12xx v2 (IvyBridge)",
"clockMegahertz":2593.992,"flags":["aes","apic","arat", "avx","clflush","cmov",
"constant_tsc","cx16","cx8","de","eagerfpu","ept","erms","f16c","flexpriority",
"fpu","fsgsbase","fxsr","hypervisor" ,"lahf_lm","lm","mca","mce","mmx","msr",
"mtrr","nopl","nx","pae","pat", "pclmulqdq","pge","pni","popcnt","pse","pse36",
"rdrand","rdtscp", "rep_good","sep","smep","sse","sse2","sse4_1","sse4_2",
"ssse3","syscall","tpr_shadow","tsc","tsc_adjust","tsc_deadline_timer","vme",
"vmx","vnmi","vpid","x2apic","xsave","xsaveopt","xtopology"],"count":4}
,"hostname":"node-0"},"provisioning":{"state":"provisioned",
"ID":"73c01ec4-5438-4b50-a49d-4cc4633b2ccb",
"image":{"url":"http://172.22.0.1/images/bionic-server-cloudimg-amd64.img
","checksum":"http://172.22.0.1/images/bionic-server-cloudimg-amd64.img.md5sum
"}},"goodCredentials":{"credentials":{"name":"node-0-bmc-secret", "namespace":
"metal3"},"credentialsVersion":"6139"},"triedCredentials":
{"credentials":{"name":"node-0-bmc-secret","namespace":"metal3"},
"credentialsVersion":"6139"},"errorMessage":"","poweredOn":true,
"operationHistory":{"register":{"start":"2020-05-13T14:57:10Z",
"end":"2020-05-13T14:57:11Z"},"inspect":{"start": "2020-05-13T14:46:13Z",
"end":"2020-05-13T14:48:23Z"},"provision":
{"start":"2020-05-13T14:57:12Z","end":"2020-05-13T15:03:45Z"},
deprovision":{"start":null,"end":null}}}'