OK, so you ran it before I made the switch to using Caddy as the web server. Enter the jail using iocage console nextcloud, and then see what happens with acme.sh: acme.sh --cron. If that fails (as in doesn't run at all), try /root/.acme.sh/acme.sh --cron.
Hi, thanks for your help. I tried the suggestion that you gave :
[root@nextcloud ~]# acme.sh --cron
[Sat Aug 10 10:41:20 CEST 2019] ===Starting cron===
[Sat Aug 10 10:41:20 CEST 2019] Renew: 'cloud.kimschrijft.be'
[Sat Aug 10 10:41:20 CEST 2019] Skip, Next renewal time is: Wed Sep 25 22:10:25UTC 2019
[Sat Aug 10 10:41:20 CEST 2019] Add '--force' to force to renew.
[Sat Aug 10 10:41:20 CEST 2019] Skipped cloud.kimschrijft.be
[Sat Aug 10 10:41:20 CEST 2019] ===End cron===
Then I tried the --force as suggested :
[root@nextcloud ~]# acme.sh --cron --force
[Sat Aug 10 10:42:04 CEST 2019] ===Starting cron===
[Sat Aug 10 10:42:04 CEST 2019] Renew: 'cloud.kimschrijft.be'
[Sat Aug 10 10:42:05 CEST 2019] Single domain='cloud.kimschrijft.be'
[Sat Aug 10 10:42:05 CEST 2019] Getting domain auth token for each domain
[Sat Aug 10 10:42:07 CEST 2019] Getting webroot for domain='cloud.kimschrijft.be'
[Sat Aug 10 10:42:07 CEST 2019] cloud.kimschrijft.be is already verified, skip http-01.
[Sat Aug 10 10:42:07 CEST 2019] Verify finished, start to sign.
[Sat Aug 10 10:42:07 CEST 2019] Lets finalize the order, Le_OrderFinalize:
https://acme-v02.api.letsencrypt.org/acme/finalize/53211843/869172422
[Sat Aug 10 10:42:09 CEST 2019] Download cert, Le_LinkCert:
https://acme-v02.api.letsencrypt.org/acme/cert/0326cb5b53d6086cdc070fac019d1a0d0f80
[Sat Aug 10 10:42:10 CEST 2019] Cert success.
-----BEGIN CERTIFICATE-----
MIIGYDCCBUigAwIBAgISAybLW1PWCGzcBw+sAZ0aDQ+AMA0GCSqGSIb3DQEBCwUA
MEoxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MSMwIQYDVQQD
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5c+wigC5KqqrVTB2Jp1NFWdGPLtal9RFDqD07NiSjVVkYiUNihpG18Mmmuw6qg1t
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AFmfCAPuNcIwOLN3eGHpi3FQmRIGs8eCSp5imxaolxEKOcabuvBc9cnfs/EZ/LsV
UHtZPw==
-----END CERTIFICATE-----
[Sat Aug 10 10:42:10 CEST 2019] Your cert is in /root/.acme.sh/cloud.kimschrijft.be/cloud.kimschrijft.be.cer
[Sat Aug 10 10:42:10 CEST 2019] Your cert key is in /root/.acme.sh/cloud.kimschrijft.be/cloud.kimschrijft.be.key
[Sat Aug 10 10:42:10 CEST 2019] The intermediate CA cert is in /root/.acme.sh/cloud.kimschrijft.be/ca.cer
[Sat Aug 10 10:42:10 CEST 2019] And the full chain certs is there: /root/.acme.sh/cloud.kimschrijft.be/fullchain.cer
[Sat Aug 10 10:42:10 CEST 2019] Installing key to:/usr/local/etc/pki/tls/private/privkey.pem
[Sat Aug 10 10:42:10 CEST 2019] Installing full chain to:/usr/local/etc/pki/tls/certs/fullchain.pem
[Sat Aug 10 10:42:10 CEST 2019] Run reload cmd: service apache24 reload
Performing sanity check on apache24 configuration:
Syntax OK
Performing sanity check on apache24 configuration:
Syntax OK
Performing a graceful restart
[Sat Aug 10 10:42:10 CEST 2019] Reload success
[Sat Aug 10 10:42:10 CEST 2019] ===End cron===
[root@nextcloud ~]#
However still blank screen on 'cloud.kimschrijft.be' in firefox. In Edge i get a HTTP 500 error.