/** Unbind the EIP that this instance is associated with. */
public void unbindEIP() throws Exception {
InstanceInfo myInfo = applicationInfoManager.getInfo();
String myPublicIP = null;
if (myInfo != null && myInfo.getDataCenterInfo().getName() == Name.Amazon) {
myPublicIP = ((AmazonInfo) myInfo.getDataCenterInfo()).get(MetaDataKey.publicIpv4);
if (myPublicIP == null) {
logger.info("Instance is not associated with an EIP. Will not try to unbind");
return;
}
try {
AmazonEC2 ec2Service = getEC2Service();
DescribeAddressesRequest describeAddressRequest =
new DescribeAddressesRequest().withPublicIps(myPublicIP);
DescribeAddressesResult result = ec2Service.describeAddresses(describeAddressRequest);
if ((result.getAddresses() != null) && (!result.getAddresses().isEmpty())) {
Address eipAddress = result.getAddresses().get(0);
DisassociateAddressRequest dissociateRequest = new DisassociateAddressRequest();
String domain = eipAddress.getDomain();
if ("vpc".equals(domain)) {
dissociateRequest.setAssociationId(eipAddress.getAssociationId());
} else {
dissociateRequest.setPublicIp(eipAddress.getPublicIp());
}
ec2Service.disassociateAddress(dissociateRequest);
logger.info("Dissociated the EIP {} from this instance", myPublicIP);
}
} catch (Throwable e) {
throw new RuntimeException("Cannot dissociate address from this instance", e);
}
}
}
/**
* Checks if an EIP is bound and optionally binds the EIP.
*
* <p>The list of EIPs are arranged with the EIPs allocated in the zone first followed by other
* EIPs.
*
* <p>If an EIP is already bound to this instance this method simply returns. Otherwise, this
* method tries to find an unused EIP based on information from AWS. If it cannot find any unused
* EIP this method, it will be retried for a specified interval.
*
* <p>One of the following scenarios can happen here :
*
* <p>1) If the instance is already bound to an EIP as deemed by AWS, no action is taken. 2) If an
* EIP is already bound to another instance as deemed by AWS, that EIP is skipped. 3) If an EIP is
* not already bound to an instance and if this instance is not bound to an EIP, then the EIP is
* bound to this instance.
*/
public void bindEIP() {
InstanceInfo myInfo = applicationInfoManager.getInfo();
String myInstanceId = ((AmazonInfo) myInfo.getDataCenterInfo()).get(MetaDataKey.instanceId);
String myZone = ((AmazonInfo) myInfo.getDataCenterInfo()).get(MetaDataKey.availabilityZone);
Collection<String> candidateEIPs = getCandidateEIPs(myInstanceId, myZone);
AmazonEC2 ec2Service = getEC2Service();
boolean isMyinstanceAssociatedWithEIP = false;
Address selectedEIP = null;
for (String eipEntry : candidateEIPs) {
try {
String associatedInstanceId;
// Check with AWS, if this EIP is already been used by another instance
DescribeAddressesRequest describeAddressRequest =
new DescribeAddressesRequest().withPublicIps(eipEntry);
DescribeAddressesResult result = ec2Service.describeAddresses(describeAddressRequest);
if ((result.getAddresses() != null) && (!result.getAddresses().isEmpty())) {
Address eipAddress = result.getAddresses().get(0);
associatedInstanceId = eipAddress.getInstanceId();
// This EIP is not used by any other instance, hence mark it for selection if it is not
// already marked.
if (((associatedInstanceId == null) || (associatedInstanceId.isEmpty()))) {
if (selectedEIP == null) {
selectedEIP = eipAddress;
}
} else if (isMyinstanceAssociatedWithEIP = (associatedInstanceId.equals(myInstanceId))) {
// This EIP is associated with an instance, check if this is the same as the current
// instance.
// If it is the same, stop searching for an EIP as this instance is already associated
// with an
// EIP
selectedEIP = eipAddress;
break;
} else {
// The EIP is used by some other instance, hence skip it
logger.warn(
"The selected EIP {} is associated with another instance {} according to AWS,"
+ " hence skipping this",
eipEntry,
associatedInstanceId);
}
}
} catch (Throwable t) {
logger.error("Failed to bind elastic IP: {} to {}", eipEntry, myInstanceId, t);
}
}
if (null != selectedEIP) {
String publicIp = selectedEIP.getPublicIp();
// Only bind if the EIP is not already associated
if (!isMyinstanceAssociatedWithEIP) {
AssociateAddressRequest associateAddressRequest =
new AssociateAddressRequest().withInstanceId(myInstanceId);
String domain = selectedEIP.getDomain();
if ("vpc".equals(domain)) {
associateAddressRequest.setAllocationId(selectedEIP.getAllocationId());
} else {
associateAddressRequest.setPublicIp(publicIp);
}
ec2Service.associateAddress(associateAddressRequest);
logger.info(
"\n\n\nAssociated {} running in zone: {} to elastic IP: {}",
myInstanceId,
myZone,
publicIp);
}
logger.info(
"My instance {} seems to be already associated with the EIP {}", myInstanceId, publicIp);
} else {
logger.info(
"No EIP is free to be associated with this instance. Candidate EIPs are: {}",
candidateEIPs);
}
}