【Linux共通】Let’s Encrypt 発行方法(DNS認証)

[tmcadmin@TMCZXSV01 etc]$ sudo certbot certonly \
–manual \
–preferred-challenges dns \
-d zabbix.three-meister.com
Saving debug log to /var/log/letsencrypt/letsencrypt.log
Requesting a certificate for zabbix.three-meister.com

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Please deploy a DNS TXT record under the name:

_acme-challenge.zabbix.three-meister.com.

with the following value:

PnKFeEf2OE7f8qrHNk0abdPmS0UHo8s4dqXJLllcpM4

Before continuing, verify the TXT record has been deployed. Depending on the DNS
provider, this may take some time, from a few seconds to multiple minutes. You can
check if it has finished deploying with aid of online tools, such as the Google
Admin Toolbox: https://toolbox.googleapps.com/apps/dig/#TXT/_acme-challenge.zabbix.three-meister.com.
Look for one or more bolded line(s) below the line ‘;ANSWER’. It should show the
value(s) you’ve just added.

– – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – –
Press Enter to Continue

Successfully received certificate.
Certificate is saved at: /etc/letsencrypt/live/zabbix.three-meister.com/fullchain.pem
Key is saved at: /etc/letsencrypt/live/zabbix.three-meister.com/privkey.pem
This certificate expires on 2026-11-05.
These files will be updated when the certificate renews.

NEXT STEPS:
– This certificate will not be renewed automatically. Autorenewal of –manual certificates requires the use of an authentication hook script (–manual-auth-hook) but one was not provided. To renew this certificate, repeat this same certbot command before the certificate’s expiry date.

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If you like Certbot, please consider supporting our work by:
* Donating to ISRG / Let’s Encrypt: https://letsencrypt.org/donate
* Donating to EFF: https://eff.org/donate-le
– – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – –

[tmcadmin@TMCZXSV01 etc]$ sudo cat /etc/httpd/conf.d/ssl.conf
[sudo] tmcadmin のパスワード:
#
# When we also provide SSL we have to listen to the
# standard HTTPS port in addition.
#
Listen 443 https

##
## SSL Global Context
##
## All SSL configuration in this context applies both to
## the main server and all SSL-enabled virtual hosts.
##

# Pass Phrase Dialog:
# Configure the pass phrase gathering process.
# The filtering dialog program (`builtin’ is a internal
# terminal dialog) has to provide the pass phrase on stdout.
SSLPassPhraseDialog exec:/usr/libexec/httpd-ssl-pass-dialog

# Inter-Process Session Cache:
# Configure the SSL Session Cache: First the mechanism
# to use and second the expiring timeout (in seconds).
SSLSessionCache shmcb:/run/httpd/sslcache(512000)
SSLSessionCacheTimeout 300

#
# Use “SSLCryptoDevice” to enable any supported hardware
# accelerators. Use “openssl engine -v” to list supported
# engine names. NOTE: If you enable an accelerator and the
# server does not start, consult the error logs and ensure
# your accelerator is functioning properly.
#
SSLCryptoDevice builtin
#SSLCryptoDevice ubsec

##
## SSL Virtual Host Context
##

<VirtualHost _default_:443>

# General setup for the virtual host, inherited from global configuration
#DocumentRoot “/var/www/html”
ServerName zabbix.three-meister.com
※コメントを外して、サーバー名を変更

# Use separate log files for the SSL virtual host; note that LogLevel
# is not inherited from httpd.conf.
ErrorLog logs/ssl_error_log
TransferLog logs/ssl_access_log
LogLevel warn

# SSL Engine Switch:
# Enable/Disable SSL for this virtual host.
SSLEngine on

# List the protocol versions which clients are allowed to connect with.
# The OpenSSL system profile is used by default. See
# update-crypto-policies(8) for more details.
#SSLProtocol all -SSLv3
#SSLProxyProtocol all -SSLv3

# User agents such as web browsers are not configured for the user’s
# own preference of either security or performance, therefore this
# must be the prerogative of the web server administrator who manages
# cpu load versus confidentiality, so enforce the server’s cipher order.
SSLHonorCipherOrder on

# SSL Cipher Suite:
# List the ciphers that the client is permitted to negotiate.
# See the mod_ssl documentation for a complete list.
# The OpenSSL system profile is configured by default. See
# update-crypto-policies(8) for more details.
SSLCipherSuite PROFILE=SYSTEM
SSLProxyCipherSuite PROFILE=SYSTEM

# Point SSLCertificateFile at a PEM encoded certificate. If
# the certificate is encrypted, then you will be prompted for a
# pass phrase. Note that restarting httpd will prompt again. Keep
# in mind that if you have both an RSA and a DSA certificate you
# can configure both in parallel (to also allow the use of DSA
# ciphers, etc.)
# Some ECC cipher suites (http://www.ietf.org/rfc/rfc4492.txt)
# require an ECC certificate which can also be configured in
# parallel.
SSLCertificateFile /etc/letsencrypt/live/zabbix.three-meister.com/fullchain.pem
※先ほど発行した証明書を設定

# Server Private Key:
# If the key is not combined with the certificate, use this
# directive to point at the key file. Keep in mind that if
# you’ve both a RSA and a DSA private key you can configure
# both in parallel (to also allow the use of DSA ciphers, etc.)
# ECC keys, when in use, can also be configured in parallel
SSLCertificateKeyFile /etc/letsencrypt/live/zabbix.three-meister.com/privkey.pem
※先ほど発行した証明書Keyを設定

# Server Certificate Chain:
# Point SSLCertificateChainFile at a file containing the
# concatenation of PEM encoded CA certificates which form the
# certificate chain for the server certificate. Alternatively
# the referenced file can be the same as SSLCertificateFile
# when the CA certificates are directly appended to the server
# certificate for convenience.
#SSLCertificateChainFile /etc/pki/tls/certs/server-chain.crt

# Certificate Authority (CA):
# Set the CA certificate verification path where to find CA
# certificates for client authentication or alternatively one
# huge file containing all of them (file must be PEM encoded)
#SSLCACertificateFile /etc/pki/tls/certs/ca-bundle.crt

# Client Authentication (Type):
# Client certificate verification type and depth. Types are
# none, optional, require and optional_no_ca. Depth is a
# number which specifies how deeply to verify the certificate
# issuer chain before deciding the certificate is not valid.
#SSLVerifyClient require
#SSLVerifyDepth 10

# Access Control:
# With SSLRequire you can do per-directory access control based
# on arbitrary complex boolean expressions containing server
# variable checks and other lookup directives. The syntax is a
# mixture between C and Perl. See the mod_ssl documentation
# for more details.
#<Location />
#SSLRequire ( %{SSL_CIPHER} !~ m/^(EXP|NULL)/ \
# and %{SSL_CLIENT_S_DN_O} eq “Snake Oil, Ltd.” \
# and %{SSL_CLIENT_S_DN_OU} in {“Staff”, “CA”, “Dev”} \
# and %{TIME_WDAY} >= 1 and %{TIME_WDAY} <= 5 \
# and %{TIME_HOUR} >= 8 and %{TIME_HOUR} <= 20 ) \
# or %{REMOTE_ADDR} =~ m/^192\.76\.162\.[0-9]+$/
#</Location>

# SSL Engine Options:
# Set various options for the SSL engine.
# o FakeBasicAuth:
# Translate the client X.509 into a Basic Authorisation. This means that
# the standard Auth/DBMAuth methods can be used for access control. The
# user name is the `one line’ version of the client’s X.509 certificate.
# Note that no password is obtained from the user. Every entry in the user
# file needs this password: `xxj31ZMTZzkVA’.
# o ExportCertData:
# This exports two additional environment variables: SSL_CLIENT_CERT and
# SSL_SERVER_CERT. These contain the PEM-encoded certificates of the
# server (always existing) and the client (only existing when client
# authentication is used). This can be used to import the certificates
# into CGI scripts.
# o StdEnvVars:
# This exports the standard SSL/TLS related `SSL_*’ environment variables.
# Per default this exportation is switched off for performance reasons,
# because the extraction step is an expensive operation and is usually
# useless for serving static content. So one usually enables the
# exportation for CGI and SSI requests only.
# o StrictRequire:
# This denies access when “SSLRequireSSL” or “SSLRequire” applied even
# under a “Satisfy any” situation, i.e. when it applies access is denied
# and no other module can change it.
# o OptRenegotiate:
# This enables optimized SSL connection renegotiation handling when SSL
# directives are used in per-directory context.
#SSLOptions +FakeBasicAuth +ExportCertData +StrictRequire
<FilesMatch “\.(cgi|shtml|phtml|php)$”>
SSLOptions +StdEnvVars
</FilesMatch>
<Directory “/var/www/cgi-bin”>
SSLOptions +StdEnvVars
</Directory>

# SSL Protocol Adjustments:
# The safe and default but still SSL/TLS standard compliant shutdown
# approach is that mod_ssl sends the close notify alert but doesn’t wait for
# the close notify alert from client. When you need a different shutdown
# approach you can use one of the following variables:
# o ssl-unclean-shutdown:
# This forces an unclean shutdown when the connection is closed, i.e. no
# SSL close notify alert is sent or allowed to be received. This violates
# the SSL/TLS standard but is needed for some brain-dead browsers. Use
# this when you receive I/O errors because of the standard approach where
# mod_ssl sends the close notify alert.
# o ssl-accurate-shutdown:
# This forces an accurate shutdown when the connection is closed, i.e. a
# SSL close notify alert is sent and mod_ssl waits for the close notify
# alert of the client. This is 100% SSL/TLS standard compliant, but in
# practice often causes hanging connections with brain-dead browsers. Use
# this only for browsers where you know that their SSL implementation
# works correctly.
# Notice: Most problems of broken clients are also related to the HTTP
# keep-alive facility, so you usually additionally want to disable
# keep-alive for those clients, too. Use variable “nokeepalive” for this.
# Similarly, one has to force some clients to use HTTP/1.0 to workaround
# their broken HTTP/1.1 implementation. Use variables “downgrade-1.0” and
# “force-response-1.0” for this.
BrowserMatch “MSIE [2-5]” \
nokeepalive ssl-unclean-shutdown \
downgrade-1.0 force-response-1.0

# Per-Server Logging:
# The home of a custom SSL log file. Use this when you want a
# compact non-error SSL logfile on a virtual host basis.
CustomLog logs/ssl_request_log \
“%t %h %{SSL_PROTOCOL}x %{SSL_CIPHER}x \”%r\” %b”

</VirtualHost>