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@ -461,6 +461,7 @@ This guide is about AWS, not DevOps or server configuration management in genera
- **NTP and accurate time:** If you are not using Amazon Linux (which comes preconfigured), you should confirm your servers [configure NTP correctly](https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/set-time.html#configure_ntp), to avoid insidious time drift (which can then cause all sorts of issues, from breaking API calls to misleading logs). This should be part of your automatic configuration for every server. If time has already drifted substantially (generally >1000 seconds), remember NTP won’t shift shift it back, so you may need to remediate manually (for example, [like this](http://askubuntu.com/questions/254826/how-to-force-a-clock-update-using-ntp) on Ubuntu).
Security and IAM
----------------
@ -1218,7 +1219,7 @@ Billing and Cost Management
- 🔹Enable [billing reports](https://docs.aws.amazon.com/awsaccountbilling/latest/aboutv2/detailed-billing-reports.html) and install an open source tool to help manage or monitor AWS resource utilization. [**Netflix Ice**](https://github.com/Netflix/ice) is probably the first one you should try. Check out [docker-ice](https://github.com/jonbrouse/docker-ice) for a Dockerized version that eases installation.
- 🔸One challenge with Ice is that it doesn’t cover amortized cost of reserved instances.
- Other tools include [Security Monkey](https://github.com/Netflix/security_monkey) and [Cloud Custodian](https://github.com/capitalone/cloud-custodian).
- **Third-party services:** Several companies offer services designed to help you gain insights into expenses or lower your AWS bill, such as [OpsClarity](http://http//www.opsclarity.com/), [Cloudability](https://www.cloudability.com/), [CloudHealth Technologies](https://www.cloudhealthtech.com/), and [ParkMyCloud](http://www.parkmycloud.com/). Some of these charge a percentage of your bill, which may be expensive. See the [market landscape](#tools-and-services-market-landscape).
- **Third-party services:** Several companies offer services designed to help you gain insights into expenses or lower your AWS bill, such as [OpsClarity](http://www.opsclarity.com/), [Cloudability](https://www.cloudability.com/), [CloudHealth Technologies](https://www.cloudhealthtech.com/), and [ParkMyCloud](http://www.parkmycloud.com/). Some of these charge a percentage of your bill, which may be expensive. See the [market landscape](#tools-and-services-market-landscape).
- AWS’s [Trusted Advisor](https://aws.amazon.com/premiumsupport/trustedadvisor/) is another service that can help with cost concerns.
- Don’t be shy about asking your account manager for guidance in reducing your bill. It’s their job to keep you happily using AWS.
- **Tagging for cost visibility:** As the infrastructure grows, a key part of managing costs is understanding where they lie. It’s strongly advisable to [tag resources](https://aws.amazon.com/blogs/aws/resource-groups-and-tagging/), and as complexity grows, group them effectively. If you [set up billing allocation appropriately](http://aws.amazon.com/blogs/aws/aws-cost-allocation/), you can then get visibility into expenses according to organization, product, individual engineer, or any other way that is helpful.