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server: trim autoscale Windows VM hostname #11327

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server: trim autoscale Windows VM hostname #11327

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36e636a
server: trim autoscale Windows VM hostname
shwstppr Jul 29, 2025
0c34a76
fix
shwstppr Jul 30, 2025
aa21706
fix imports
shwstppr Jul 30, 2025
b97ef66
Merge remote-tracking branch 'apache/main' into fix-autoscalewinvm
shwstppr Aug 1, 2025
4c9de62
Merge branch 'main' into fix-autoscalewinvm
shwstppr Aug 8, 2025
4c9ff4c
improve
shwstppr Aug 25, 2025
16240b9
return if okay
shwstppr Aug 26, 2025
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17 changes: 12 additions & 5 deletions server/src/main/java/com/cloud/network/as/AutoScaleManagerImpl.java
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Original file line number Diff line number Diff line change
Expand Up @@ -1968,12 +1968,19 @@ protected Pair<String, String> getNextVmHostAndDisplayName(AutoScaleVmGroupVO as
RandomStringUtils.random(VM_HOSTNAME_RANDOM_SUFFIX_LENGTH, 0, 0, true, false, (char[])null, new SecureRandom()).toLowerCase();
// Truncate vm group name because max length of vm name is 63
int subStringLength = Math.min(asGroup.getName().length(), 63 - VM_HOSTNAME_PREFIX.length() - vmHostNameSuffix.length());
String displayName = VM_HOSTNAME_PREFIX + asGroup.getName().substring(0, subStringLength) + vmHostNameSuffix;
String hostName = displayName;
if (isWindows) {
hostName = displayName.substring(Math.max(0, displayName.length() - 15));
String name = VM_HOSTNAME_PREFIX + asGroup.getName().substring(0, subStringLength) + vmHostNameSuffix;
if (!isWindows) {
return new Pair<>(name, name);
}
return new Pair<>(hostName, displayName);
String hostName = name.substring(Math.max(0, name.length() - 15));
if (Character.isLetterOrDigit(hostName.charAt(0))) {
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it seems digit it not supported as first char ? @shwstppr

cloudstack/server/src/main/java/com/cloud/vm/UserVmManagerImpl.java

Lines 4104 to 4109 in 1272b13

public void checkNameForRFCCompliance(String name) {
if (!NetUtils.verifyDomainNameLabel(name, true)) {
throw new InvalidParameterValueException("Invalid name. Vm name can contain ASCII letters 'a' through 'z', the digits '0' through '9', "
+ "and the hyphen ('-'), must be between 1 and 63 characters long, and can't start or end with \"-\" and can't start with digit");
}
}

return new Pair<>(hostName, name);
}
String temp = name.substring(0, Math.max(0, name.length() - 15)).replaceAll("[^a-zA-Z0-9]", "");
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edge case: all of the last 15 chars are special chars or whitespace. I think we better do a replace first and then take the last 15.

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@DaanHoogland I don't think this case can happen.
The only user-defined part in the VM name is the name of the autoscale group, and we've checks for that to only contain letters, numbers and hyphen. checkAutoScaleVmGroupName` does that

if (!temp.isEmpty()) {
return new Pair<>(temp.charAt(temp.length() - 1) + hostName.substring(1), name);
}
return new Pair<>('a' + hostName.substring(1), name);
}

@Override
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