Update cheatsheets

tldr/cisco-ios/crypto

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+---
+syntax: markdown
+tags: [tldr, cisco-ios]
+source: https://github.com/tldr-pages/tldr.git
+---
+# crypto
+
+> Manage cryptography.
+> Accessed in configuration mode.
+> More information: <https://www.cisco.com/c/en/us/td/docs/security/asa/asa-cli-reference/A-H/asa-command-ref-A-H/crypto-is-cz-commands.html>.
+
+- Generate an `rsa` key:
+
+`crypto key generate rsa`

tldr/linux/hd-idle

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# hd-idle
+
+> Spin down external disks after a period of idle time.
+> More information: <https://manned.org/hd-idle>.
+
+- Start a service to manage hard drive spin down. By default hard disks will spin down after 10 minutes of inactivity:
+
+`systemctl start hd-idle`
+
+- Spin down a disk immediately:
+
+`hd-idle -t {{/dev/sdX}}`
+
+- Set disks to never spin down, then set explicit idle times (in seconds) for disks which have "sda" or "sdb" in their device name:
+
+`hd-idle -i 0 -a /dev/sda -i {{300}} -a /dev/sdb -i {{1200}}`

tldr/openstack-flavor

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# openstack flavor
+
+> Manage OpenStack instance flavors (virtual hardware templates).
+> More information: <https://docs.openstack.org/python-openstackclient/latest/cli/command-objects/flavor.html>.
+
+- List all flavors:
+
+`openstack flavor list`
+
+- Show details of a flavor:
+
+`openstack flavor show {{flavor_id_or_name}}`
+
+- Create a new flavor with 2 vCPUs, 4GB RAM, and 20GB disk:
+
+`openstack flavor create {{flavor_name}} --vcpus 2 --ram 4096 --disk 20`
+
+- Delete a flavor:
+
+`openstack flavor delete {{flavor_id_or_name}}`
+
+- Create a flavor with 10GB ephemeral disk and 512MB swap space:
+
+`openstack flavor create {{flavor_name}} --vcpus 4 --ram 8192 --disk 40 --ephemeral 10 --swap 512`