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August 29, 2015 14:04
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Go compiled binary to query an instance for tags vs aws cli.
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$ time aws ec2 describe-instances --instance-ids "$(curl -s http://169.254.169.254/latest/meta-data/instance-id)" --query 'Reservations[*].Instances[*].Tags' --output text | |
Owner amit.bakshi | |
Billing_Code ops | |
Name ops-deploy-003 | |
Hostgroup ops-deploy | |
Megatron_Deployment deploy | |
real 0m1.016s | |
user 0m0.321s | |
sys 0m0.134s | |
$ time ./ec2-tags | |
Billing_Code ops | |
Name ops-deploy-003 | |
Hostgroup ops-deploy | |
Megatron_Deployment deploy | |
Owner amit.bakshi | |
real 0m0.133s | |
user 0m0.018s | |
sys 0m0.014s | |
# with some dynamic libs | |
$ CGO_ENABLED=1 go build . | |
$ ldd ec2-tags | |
linux-vdso.so.1 => (0x00007fff77efc000) | |
libpthread.so.0 => /lib64/libpthread.so.0 (0x0000003b64600000) | |
libc.so.6 => /lib64/libc.so.6 (0x0000003b64200000) | |
/lib64/ld-linux-x86-64.so.2 (0x0000003b63e00000) | |
# no dynamic libs | |
$ CGO_ENABLED=0 go build . | |
$ ldd ec2-tags | |
not a dynamic executable | |
$ strip ec2-tags | |
$ ls -alh ec2-tags | |
-rwxr-xr-x 1 nobody nobody 5.0M Aug 1 11:00 ec2-tags* | |
$ file ec2-tags | |
ec2-tags: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), statically linked, stripped | |
$ ./ec2-tags -p | |
ec2_tag_name=ops-deploy-003 | |
ec2_tag_hostgroup=ops-deploy | |
ec2_tag_megatron_deployment=deploy | |
ec2_tag_owner=amit.bakshi | |
ec2_tag_billing_code=ops | |
$ ./ec2-tags -format sh | |
OWNER=amit.bakshi | |
BILLING_CODE=ops | |
NAME=ops-deploy-003 | |
HOSTGROUP=ops-deploy | |
MEGATRON_DEPLOYMENT=deploy |
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