ceph-run: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On CentOS possible default full paths are:

/usr/bin/ceph-run - from package: ceph

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/ceph-run - from package: ceph

You may install the required package with command apt-get install {package}

Error in other languages:
ceph-run: bevel nie gevind nie
ceph-run: comandă negăsită
ceph-run: comando não encontrado
ceph-run: commande introuvable
ceph-run: command not found
ceph-run: käsku ei ole
ceph-run: không tìm thấy lệnh
ceph-run: komanda nerasta
ceph-run: Kommando nicht gefunden.
ceph-run: kommandot finns inte
ceph-run: komut yok
ceph-run: nie znaleziono polecenia
ceph-run: níor aimsíodh an t-ordú
ceph-run: no se encontró la orden
ceph-run: no s'ha trobat l'ordre
ceph-run: opdracht niet gevonden
ceph-run: parancs nem található
ceph-run: perintah tidak ditemukan
ceph-run: príkaz nenájdený
ceph-run: příkaz nenalezen
ceph-run: команда не найдена
ceph-run: командата не е открита
ceph-run: 命令找不到
ceph-run: コマンドが見つかりません