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1Fix the driver behind crashes, sound loss and screen glitches2Clear out junk files and repair common Windows errors3Scan for outdated or missing drivers - takes under a minuteUse a separate Host block in ~/.ssh/config for every server or server group. Set the real destination with HostName, the login account with User, and the matching private key with IdentityFile. Add IdentitiesOnly yes when you want OpenSSH to ignore unrelated keys loaded in ssh-agent.
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After that one-time setup, connect with short commands such as ssh production and ssh staging instead of repeatedly typing -i or risking the wrong key.
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The basic configuration
OpenSSH reads per-user settings from ~/.ssh/config. A configuration alias is the word written after Host; it does not have to be the server’s DNS name. HostName supplies the actual DNS name or IP address used for the connection.
Host production
HostName prod.example.com
User deploy
IdentityFile ~/.ssh/id_ed25519_production
IdentitiesOnly yes
Host staging
HostName staging.example.com
User deploy
IdentityFile ~/.ssh/id_ed25519_staging
IdentitiesOnly yesWith this file saved, run ssh production to reach prod.example.com as deploy using the production key, or ssh staging to use the staging key. The alias keeps the command stable even if the underlying hostname changes later.
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Prepare the keys and configuration file
Inventory the private keys
Before editing the configuration, identify the private key file that belongs to each server. Use clear names that reflect the trust boundary, such as id_ed25519_production and id_ed25519_staging. The corresponding public-key files may sit beside them, but IdentityFile points to the private key.
Do not paste private-key contents into tickets, chat, scripts, or shell history. Keep each private key protected with restrictive filesystem permissions. If a key is copied to another workstation, protect the copy there as well.
Create or edit ~/.ssh/config
- Create the per-user SSH directory and configuration file if they do not already exist.
- Open
~/.ssh/configin your editor. - Add one
Hostblock for each server or group, using spaces to indent the settings. - Save the file, then inspect the effective result with
ssh -Gbefore making a production connection.
Each block should contain, at minimum, a host selector, the real destination, the remote account, and the intended private key. Adding IdentitiesOnly yes makes the selection strict when an authentication agent is active.
What each directive controls
Host: the selector or alias
Host determines which configuration block applies. An explicit name such as production creates a readable alias. You can also use patterns to apply one block to several names.
HostName: the real destination
HostName is the DNS name or address that OpenSSH contacts. It is independent of the alias. For example, Host production can map to HostName 203.0.113.20 without changing the command you type.
User: the remote login account
User sets the account used on the Linux server. If it is omitted, OpenSSH normally derives the account from your local username, which may not be the account intended for administration or deployment. Set it explicitly when servers use a dedicated account.
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IdentityFile: the private key to offer
IdentityFile names a private key used for public-key authentication. Use an explicit path when each server has a different trust boundary. A path beginning with ~ is supported, so ~/.ssh/id_ed25519_production refers to a file below the current user’s home directory.
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IdentitiesOnly yes: prevent unrelated agent keys
OpenSSH can receive identities from an authentication agent. When several keys are loaded, the client may offer keys that are unrelated to the destination. IdentitiesOnly yes tells the client to use only the configured identity and certificate files, even when the agent offers additional identities.
This matters because a server can reject a connection after too many incorrect key offers. Pairing one IdentityFile with IdentitiesOnly yes gives each alias a predictable key-selection boundary.
Set up separate aliases step by step
Production and staging example
- Choose distinct private-key filenames, for example
~/.ssh/id_ed25519_productionand~/.ssh/id_ed25519_staging. - Open
~/.ssh/config. - Add this configuration:
Host production
HostName prod.example.com
User deploy
IdentityFile ~/.ssh/id_ed25519_production
IdentitiesOnly yes
Host staging
HostName staging.example.com
User deploy
IdentityFile ~/.ssh/id_ed25519_staging
IdentitiesOnly yes- Save the file.
- Run
ssh -G productionand check that the resolvedhostname,user,identityfile, andidentitiesonlyvalues match production. - Repeat with
ssh -G stagingfor the staging alias. - Connect with
ssh productionorssh staging.
The command uses the alias, while the connection uses the destination, account, and key resolved from its block.
Use a different account as well as a different key
A key and a username are separate settings. If production requires admin while staging uses deploy, give each alias its own User value even when the key filenames follow the same naming pattern.
Host production
HostName prod.example.com
User admin
IdentityFile ~/.ssh/id_ed25519_production
IdentitiesOnly yes
Host staging
HostName staging.example.com
User deploy
IdentityFile ~/.ssh/id_ed25519_staging
IdentitiesOnly yesUse wildcard patterns for server groups
Host accepts patterns. A wildcard group is useful when many servers share the same account and key policy.
Apply one key to a domain group
Host *.prod.example.com
User deploy
IdentityFile ~/.ssh/id_ed25519_production
IdentitiesOnly yesThis block matches names ending in .prod.example.com. For example, api.prod.example.com and worker.prod.example.com receive the same settings when those names are used as the connection targets.
Understand the pattern characters
*matches any sequence of characters.?matches one character.- Comma-separated pattern lists combine alternatives.
- A pattern can be negated by placing
!before it.
A pattern list containing only negated patterns does not produce a positive match. Include at least one positive pattern when using exclusions.
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Combine a group with an exception
Use a positive group pattern and then exclude a host that must use another policy. The exact arrangement should be tested with ssh -G, because the effective result depends on which selectors match the name you supply.
Host *.example.com !legacy.example.com
User deploy
IdentityFile ~/.ssh/id_ed25519_standard
IdentitiesOnly yesThe positive pattern identifies the group; the negated pattern prevents the named exception from matching that group. Give the exception its own explicit block or another matching rule.
Choose aliases when names are unstable
Use an explicit alias when you want a short, stable command or when the same server is reached through different names. A wildcard is best for a genuinely uniform group. Do not force a wildcard onto hosts that have different keys or accounts merely because their DNS names look similar.
Why multiple IdentityFile lines can surprise you
Multiple IdentityFile directives are additive: “Multiple IdentityFile directives will add to the list of identities tried.” They do not replace one another the way a single-valued option would.
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HostName recovery.example.com
User root
IdentityFile ~/.ssh/id_ed25519_recovery_primary
IdentityFile ~/.ssh/id_ed25519_recovery_backupIn this example, both identities are candidates and are tried in sequence. That is appropriate only when deliberately trying a sequence is part of the connection design. For strict per-server selection, use one IdentityFile together with IdentitiesOnly yes.
Parameterized key paths
IdentityFile supports ~ and documented tokens that are expanded for the connection. Tokenized paths can reduce repetition when a predictable naming scheme covers many hosts.
| Token | Meaning | Example use |
|---|---|---|
%d |
Local home directory | %d/.ssh/keys/%h |
%h |
Remote host | ~/.ssh/keys/%h |
%n |
Original host name supplied to SSH | ~/.ssh/keys/%n |
%p |
Port | ~/.ssh/keys/%h-%p |
%r |
Remote user | ~/.ssh/keys/%r@%h |
%u |
Local user | ~/.ssh/keys/%u/%h |
%h represents the resolved remote host, whereas %n preserves the original name you supplied, such as an alias. That distinction is useful when aliases map several names to one destination. Explicit filenames remain easier to audit when servers have different trust boundaries, so use tokens only when the naming rule is clear and dependable.
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Choose between aliases, wildcard groups, and -i
The command-line option -i can select a key for a single connection, but it is easy to mistype and does not encode the account or destination. The configuration-file approaches make the policy repeatable.
| Setup | Repeatability | Wrong-key risk | Auditing | ssh-agent behavior | Portability |
|---|---|---|---|---|---|
Explicit aliases in ~/.ssh/config |
High after one-time setup | Low when each block has one key and IdentitiesOnly yes |
Easy to review in one file | Unrelated agent identities are excluded when IdentitiesOnly yes is set |
Requires copying the key files and config to another machine |
Wildcard Host groups |
High for uniform server groups | Depends on accurate patterns and exceptions | Group policy is visible, but exceptions must be checked | Follows the group’s IdentitiesOnly setting |
Portable when the pattern and key naming scheme are preserved |
Command-line -i |
Low; repeated for each command | Higher because the key is selected manually each time | Selection is scattered across shell history and scripts | Does not by itself prevent other agent identities from being offered | Works without a config file on the current machine |
For regular administration, explicit aliases are the clearest default. Use wildcard groups only where the same identity policy truly applies. Reserve -i for one-off connections, diagnostics, or environments where you cannot install a per-user configuration.
Verify the effective configuration before connecting
ssh -G production asks the client to print the effective configuration for the alias without opening an interactive session. Check these resolved fields:
hostnamemust be the intended DNS name or address.usermust be the intended remote account.identityfilemust contain the expected private-key path.identitiesonlyshould be enabled when strict per-server selection is required.
Run the same check for every alias that matters, including names covered by wildcard rules. This catches a typo in an alias, an unexpected pattern match, or a key path that points to the wrong file before authentication begins.
Host-key identity is separate from user-key identity
HostKeyAlias controls the name used for host-key lookup and storage. It is useful in situations such as tunneling or multiple servers running on one host, where the name used for host-key database operations needs to differ from the connection name.
HostKeyAlias does not choose the private key used to authenticate your user. Keep host-key naming and user-key selection conceptually separate: use IdentityFile for the latter, and change HostKeyAlias only when host-key database naming and validation require it.
Troubleshoot the common failure modes
The wrong key is offered
Inspect the alias with ssh -G alias. If the identityfile value is wrong, correct the matching Host block or the alias you typed. If the path is correct but an agent still supplies other identities, add IdentitiesOnly yes to that block.
The server rejects the connection after several offers
This usually indicates that too many identities were presented before the intended key. Use one IdentityFile and IdentitiesOnly yes for that server, then verify the effective values with ssh -G.
The alias reaches the wrong machine
Check the resolved hostname. Remember that the word after Host is only a selector; HostName is the actual destination. Correct the latter if a DNS name or address was mistyped.
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Check the resolved user value. A valid private key can still fail when it is offered to the wrong account. Set User explicitly for aliases that do not use your local username.
A wildcard affects an exception
Review every pattern that can match the supplied name, including negated patterns. Give exceptional hosts explicit aliases and inspect each one with ssh -G. A stable alias is often safer than relying on a broad pattern for a host with a different trust boundary.
Two keys are being tried unexpectedly
Search the matching configuration for repeated IdentityFile directives. They add to the identity list rather than replacing earlier entries. Remove the extra directive unless sequential attempts are intentional.
Operational and security practices
- Use a distinct private key for each server or trust group when separation is required.
- Name keys so an operator can identify their purpose without opening them.
- Keep private keys under the SSH directory with restrictive permissions.
- Use
IdentitiesOnly yesfor aliases where an unrelated agent key could cause rejection or policy confusion. - Review
ssh -Goutput after changing a hostname, username, key path, or pattern. - Keep the configuration and private keys synchronized when moving to another workstation; the alias alone is not the key.
- Do not treat
HostKeyAliasas an authentication setting. It changes host-key database naming and validation behavior, not the user private key.
A complete, auditable example
The following file separates production, staging, and a production subdomain group while keeping the key choice explicit.
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HostName prod.example.com
User deploy
IdentityFile ~/.ssh/id_ed25519_production
IdentitiesOnly yes
Host staging
HostName staging.example.com
User deploy
IdentityFile ~/.ssh/id_ed25519_staging
IdentitiesOnly yes
Host *.prod.example.com
User deploy
IdentityFile ~/.ssh/id_ed25519_production
IdentitiesOnly yesUse ssh -G production, ssh -G staging, and ssh -G api.prod.example.com to verify each route. Then connect with the alias or matching hostname. If one production subdomain needs a different key, give it an explicit alias and configuration block rather than adding a second production identity to the group.
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