Fix Linux internals hyperlink

fixes bregman-arie#18

README.md

@@ -323,8 +323,9 @@ Note: "Provisioning" tools can be used to perform configuration management to so
 
 - [ ] Monitoring
   - [ ] [Prometheus](https://prometheus.io)
-  - [ ] Nagios
-  - [ ] Datadog
+  - [ ] Nagios (Mostly legacy today)
+  - [ ] Sensu
+  - [ ] Datadog (`$$$`)
   - [ ] Zabbix
   - [ ] Monit
   - [ ] [Statuscake](https://www.statuscake.com) - Website Uptime & Performance Monitoring
@@ -338,9 +339,9 @@ Note: "Provisioning" tools can be used to perform configuration management to so
   - [ ] [SumoLogic](https://www.sumologic.com)
 
 - [ ] Dashboards
-  - [ ] Kibana (Elastic)
   - [ ] Grafana
-  - [ ] Report Portal
+  - [ ] Kibana (Elastic)
+  - [ ] Report Portal (Mostly for Test Automation)
 
 - [ ] Security
   - [ ] [Vault](https://www.vaultproject.io) - "Secure, store and tightly control access to tokens, passwords, certificates, encryption keys for protecting secrets..."
@@ -380,6 +381,16 @@ Note: "Provisioning" tools can be used to perform configuration management to so
   - [ ] OpenShift
   - [ ] Nomad
 
+- [ ] Alerting
+  - [ ] PagerDuty
+  - [ ] ServiceNow
+  - [ ] Slack (Mostly used for IM)
+
+- [ ] Metric Storage
+  - [ ] InfluxDB
+  - [ ] Splunk
+  - [ ] Cloud Storage services and Databases
+
 ## More Infra & DevOps projects
 
 <p align="center"><a href="https://github.com/bregman-arie/howtheydevops"><img src="images/how_they_devops.png"/></a></p>

resources/aws.md

@@ -16,6 +16,7 @@ Name | Comments
 [amazon-redshift-utils](https://github.com/awslabs/amazon-redshift-utils) | "Contains utilities, scripts and view which are useful in a Redshift environment"
 [Cloudcraft](https://www.cloudcraft.co) | Automated AWS diagram mapping of your cloud resources.
 [nOps](https://www.nops.io/devops/) | "for fast-moving DevOps teams helping them ... monitor, analyze, and manage provisioned cloud workloads.", **Not Free.**
+[EC2Instances.info](https://instances.vantage.sh) | "Easy Amazon EC2 Instance Comparison"
 
 ## Blog Posts & Articles
 
@@ -56,3 +57,32 @@ Name | Description
 * Set up MFA
 * Delete root account access keys
 * Create IAM users instead of using root for daily management
+
+### Cheat Sheet
+
+### IAM
+
+* List users: `aws iam list-users`
+
+### EC2
+
+* List instances: `aws ec2 describe-instances`
+* Remove security group rules:
+
+```
+aws ec2 revoke-security-group-ingress \
+    --group-name someHTTPSecurityGroup
+    --protocol tcp \
+    --port 80 \
+    --cidr 0.0.0.0/0`
+```
+
+* Add security group rules:
+
+```
+aws ec2 authorize-security-group-ingress \
+    --group-name someHTTPSecurityGroup
+    --protocol tcp \
+    --port 80 \
+    --cidr 0.0.0.0/0
+```

resources/grafana.md

@@ -0,0 +1,11 @@
+## Grafana
+
+### Random
+
+* Visualize latency for API endpoints: 
+
+```
+1. Use https://github.com/prometheus/blackbox_exporter to point API endpoints
+2. Scrape exporter with Prometheus
+3. Graph from Grafana
+```

resources/linux.md

@@ -27,8 +27,7 @@ Name | Comments
 
 Name | Comments
 :------|:------:
-[Understanding fork() system call for new process creation
-](https://www.youtube.com/watch?v=PwxTbksJ2fo) | 
+[Understanding fork() system call for new process creation](https://www.youtube.com/watch?v=PwxTbksJ2fo) | 
 
 ## Learn Linux - Videos
 
@@ -110,6 +109,7 @@ sudo ausearch -m avc -m user_avc -m selinux_err -m user_selinux_err -i -ts today
 #### Files
 
 * Sort files by size: `ls -l | sort -nk5`
+* Find broken links: `find /some/path -type l -exec test ! -e {} \; -print`
 
 #### Misc
 

resources/prometheus.md

@@ -0,0 +1,7 @@
+## Prometheus
+
+### Exporters
+
+Name | Comments
+:------|:------:
+[Blackbox Exporter](https://github.com/prometheus/blackbox_exporter) |  "blackbox probing of endpoints over HTTP, HTTPS, DNS, TCP and ICMP"