110 lines
3.5 KiB
Markdown
110 lines
3.5 KiB
Markdown
# Infrastructure Systems
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List of systems and their primary role:
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__Core Infrastructure:__
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* [boot.psi.ch](boot_server) - TFTP server for PXE booting
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* [sysdb.psi.ch](sysdb_server) - Runs sysdb, providing the dynamic iPXE, Grub and kickstart files
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* [puppet.psi.ch](puppet01) - puppet.psi.ch - Puppet server
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* [repos.psi.ch](repo_server) - Repository server
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* [lx-sync-01.psi.ch](sync_server) - System to mirror external yum repositories / packages / ...
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* [lxweb00](lxweb00) - http://linux.web.psi.ch - legacy - 129.129.190.46 - Exports further repositories from AFS
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__Additional Infrastructure__
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Sysdb Access:
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* [lxsup](lxsup) - Standard node for the linux support, primarily to run bob
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Monitoring:
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* [Icinga2](icinga2) - automatic integration into Icinga2
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* [lx-influx-01.psi.ch](influx) - Influx database server
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* [lx-metrics-01.psi.ch](metrics) - https://metrics.psi.ch - Grafana frontend for Influx
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__Enduser Systems__
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* [login.psi.ch](login) - Set of nodes for enduser use
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* cpw.psi.ch - Node to change passwords
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## SSH Certificates / Signing Public User Keys
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Generate a ssh key e.g. as follows:
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```bash
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ssh-keygen -o -a 100 -t ed25519 -f ~/.ssh/linux_id_ed25519
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```
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Use the [user ca certificate](https://git.psi.ch/linux-infra/core-linux-secrets/-/blob/main/ssh-ca/user-ca.gpg), but this is automated by pasting below function into your shell
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```bash
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function sign-user-ssh-key {
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(
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name="$1"
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pubkey="$2"
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# let the private key flow through a named pipe
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# so it never ends up on the file system
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umask 077
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pipe_base="$(mktemp)" # MacOS does not know about --dry-run
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pipe="${pipe_base}.pipe"
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echo "mkfifo '$pipe'"
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mkfifo "$pipe" || return 1
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[ -p "$pipe" ] || return 1
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echo "pass ssh-ca/user-ca > '$pipe' &"
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pass ssh-ca/user-ca > "$pipe" &
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echo "ssh-keygen -s '$pipe' -I '$name' -n '$name' -V +55w '$pubkey'"
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ssh-keygen -s "$pipe" -I "$name" -n "$name" -V +55w "$pubkey"
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echo "rm '$pipe' '$pipe_base'"
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rm "$pipe" "$pipe_base"
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)
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}
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```
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and run it with the user name as principal and the public key file
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```
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sign-user-ssh-key $PRINCIPAL $PUBKEY_FILE
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```
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More details on how this works can be found in this article: https://engineering.fb.com/2016/09/12/security/scalable-and-secure-access-with-ssh/
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## Unix Groups
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Currently we have following AD groups to grant access to certain services/systems:
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| Group | Notes |
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| ---- | ---- |
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| unx-lx_eng | Member of linux engineering - used to give access to management NFS filesystem, sysdb, ... |
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| unx-lx_support | used to give Linux supporters access to systems/services |
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| unx-puppet_adm -| associated with lxdev environment/systems |
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| unx-puppet_dev | developer of puppet code |
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| unx-puppet_usr | user of puppet (i.e. need access to linux-infra group/repos) |
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| unx-lx_users | all personal linux accounts at PSI (directly updated from SAP) |
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| unx-lx_grafana_adm | Grafana Administrators |
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| unx-lx_grafana_edi | Group with Grafana editor rights |
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These two groups are used within Service now to assign tickets:
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| Group |
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| ---- |
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| itsm-linux |
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| itsm-linux_2nd |
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Access VM infrastructure for linux core employees:
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| Group | Notes |
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| ---- | ---- |
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| VC_Admins_Linux | Access to the PSI VM Infrastructure |
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## AD Users
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| Group | Notes |
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| ---- | ---- |
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| lx-netops-api | (keytab) Used to access the netops api |
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| lx_ad_join | (keytab) Used to join a machine to AD |
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| linux_ldap ???? | was registered by Derek (he is noted as responsible in AD) - used for ???? |
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