ceilometer-agent-central: 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 Debian possible default full paths are:

/usr/bin/ceilometer-agent-central - from package: ceilometer-agent-central

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

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